The next generation of the Places SDK for iOS is now available with the release of Places SDK for iOS (New).

Place Autocomplete

Select platform: Android iOS JavaScript Web Service

Deprecation notices

The autocomplete service in the Places SDK for iOS returns place predictions in response to user search queries. As the user types, the autocomplete service returns suggestions for places such as businesses, addresses, plus codes and points of interest.

You can add autocomplete to your app in the following ways:

Add an autocomplete UI control to save development time and ensure a consistent user experience.
Get place predictions programmatically to create a customized user experience.

Adding an autocomplete UI control

The autocomplete UI control is a search dialog with built-in autocomplete functionality. As a user enters search terms, the control presents a list of predicted places to choose from. When the user makes a selection, a GMSPlace instance is returned, which your app can then use to get details about the selected place.

You can add the autocomplete UI control to your app in the following ways:

Add a full-screen control
Add a results controller
Use a table data source

Adding a full-screen control

Use the full-screen control when you want a modal context, where the autocomplete UI temporarily replaces the UI of your app until the user has made their selection. This functionality is provided by the GMSAutocompleteViewController class. When the user selects a place, your app receives a callback.

To add a full-screen control to your app:

Create a UI element in your main app to launch the autocomplete UI control, for example a touch handler on a UIButton.
Implement the GMSAutocompleteViewControllerDelegate protocol in the parent view controller.
Create an instance of GMSAutocompleteViewController and assign the parent view controller as the delegate property.
Create a GMSPlaceField to define the place data types to return.
Add a GMSAutocompleteFilter to constrain the query to a particular type of place.
Present the GMSAutocompleteViewController using [self presentViewController...].
Handle the user's selection in the didAutocompleteWithPlace delegate method.
Dismiss the controller in the didAutocompleteWithPlace, didFailAutocompleteWithError, and wasCancelled delegate methods.

The following example demonstrates one possible way to launch GMSAutocompleteViewController in response to the user tapping on a button.

Swift

import UIKit
import GooglePlaces

class ViewController: UIViewController {

  override func viewDidLoad() {
    makeButton()
  }

  // Present the Autocomplete view controller when the button is pressed.
  @objc func autocompleteClicked(_ sender: UIButton) {
    let autocompleteController = GMSAutocompleteViewController()
    autocompleteController.delegate = self

    // Specify the place data types to return.
    let fields: GMSPlaceField = GMSPlaceField(rawValue: UInt(GMSPlaceField.name.rawValue) |
      UInt(GMSPlaceField.placeID.rawValue))!
    autocompleteController.placeFields = fields

    // Specify a filter.
    let filter = GMSAutocompleteFilter()
    filter.types = [.address]
    autocompleteController.autocompleteFilter = filter

    // Display the autocomplete view controller.
    present(autocompleteController, animated: true, completion: nil)
  }

  // Add a button to the view.
  func makeButton() {
    let btnLaunchAc = UIButton(frame: CGRect(x: 5, y: 150, width: 300, height: 35))
    btnLaunchAc.backgroundColor = .blue
    btnLaunchAc.setTitle("Launch autocomplete", for: .normal)
    btnLaunchAc.addTarget(self, action: #selector(autocompleteClicked), for: .touchUpInside)
    self.view.addSubview(btnLaunchAc)
  }

}

extension ViewController: GMSAutocompleteViewControllerDelegate {

  // Handle the user's selection.
  func viewController(_ viewController: GMSAutocompleteViewController, didAutocompleteWith place: GMSPlace) {
    print("Place name: \(place.name)")
    print("Place ID: \(place.placeID)")
    print("Place attributions: \(place.attributions)")
    dismiss(animated: true, completion: nil)
  }

  func viewController(_ viewController: GMSAutocompleteViewController, didFailAutocompleteWithError error: Error) {
    // TODO: handle the error.
    print("Error: ", error.localizedDescription)
  }

  // User canceled the operation.
  func wasCancelled(_ viewController: GMSAutocompleteViewController) {
    dismiss(animated: true, completion: nil)
  }

  // Turn the network activity indicator on and off again.
  func didRequestAutocompletePredictions(_ viewController: GMSAutocompleteViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = true
  }

  func didUpdateAutocompletePredictions(_ viewController: GMSAutocompleteViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = false
  }

}

Objective-C

#import "ViewController.h"
@import GooglePlaces;

@interface ViewController () <GMSAutocompleteViewControllerDelegate>

@end

@implementation ViewController {
  GMSAutocompleteFilter *_filter;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  [self makeButton];
}

  // Present the autocomplete view controller when the button is pressed.
- (void)autocompleteClicked {
  GMSAutocompleteViewController *acController = [[GMSAutocompleteViewController alloc] init];
  acController.delegate = self;

  // Specify the place data types to return.
  GMSPlaceField fields = (GMSPlaceFieldName | GMSPlaceFieldPlaceID);
  acController.placeFields = fields;

  // Specify a filter.
  _filter = [[GMSAutocompleteFilter alloc] init];
  _filter.types = @[ kGMSPlaceTypeBank ];
  acController.autocompleteFilter = _filter;

  // Display the autocomplete view controller.
  [self presentViewController:acController animated:YES completion:nil];
}

  // Add a button to the view.
- (void)makeButton{
  UIButton *btnLaunchAc = [UIButton buttonWithType:UIButtonTypeCustom];
  [btnLaunchAc addTarget:self
             action:@selector(autocompleteClicked) forControlEvents:UIControlEventTouchUpInside];
  [btnLaunchAc setTitle:@"Launch autocomplete" forState:UIControlStateNormal];
  btnLaunchAc.frame = CGRectMake(5.0, 150.0, 300.0, 35.0);
  btnLaunchAc.backgroundColor = [UIColor blueColor];
  [self.view addSubview:btnLaunchAc];
}

  // Handle the user's selection.
- (void)viewController:(GMSAutocompleteViewController *)viewController
didAutocompleteWithPlace:(GMSPlace *)place {
  [self dismissViewControllerAnimated:YES completion:nil];
  // Do something with the selected place.
  NSLog(@"Place name %@", place.name);
  NSLog(@"Place ID %@", place.placeID);
  NSLog(@"Place attributions %@", place.attributions.string);
}

- (void)viewController:(GMSAutocompleteViewController *)viewController
didFailAutocompleteWithError:(NSError *)error {
  [self dismissViewControllerAnimated:YES completion:nil];
  // TODO: handle the error.
  NSLog(@"Error: %@", [error description]);
}

  // User canceled the operation.
- (void)wasCancelled:(GMSAutocompleteViewController *)viewController {
  [self dismissViewControllerAnimated:YES completion:nil];
}

  // Turn the network activity indicator on and off again.
- (void)didRequestAutocompletePredictions:(GMSAutocompleteViewController *)viewController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

- (void)didUpdateAutocompletePredictions:(GMSAutocompleteViewController *)viewController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

@end

Adding a results controller

Use a results controller when you want more control over the text input UI. The results controller dynamically toggles the visibility of the results list based on input UI focus.

To add a results controller to your app:

Create a GMSAutocompleteResultsViewController.
Implement the GMSAutocompleteResultsViewControllerDelegate protocol in the parent view controller and assign the parent view controller as the delegate property.
Create a UISearchController object, passing in the GMSAutocompleteResultsViewController as the results controller argument.
Set the GMSAutocompleteResultsViewController as the searchResultsUpdater property of the UISearchController.
Add the searchBar for the UISearchController to your app's UI.
Handle the user's selection in the didAutocompleteWithPlace delegate method.

There are several ways to place the search bar of a UISearchController into your app's UI:

Add a search bar to the navigation bar
Add a search bar to the top of a view
Add a search bar using popover results

Adding a search bar to the navigation bar

The following code example demonstrates adding a results controller, adding the searchBar to the navigation bar, and handling the user's selection:

Swift

class ViewController: UIViewController {

  var resultsViewController: GMSAutocompleteResultsViewController?
  var searchController: UISearchController?
  var resultView: UITextView?

  override func viewDidLoad() {
    super.viewDidLoad()

    resultsViewController = GMSAutocompleteResultsViewController()
    resultsViewController?.delegate = self

    searchController = UISearchController(searchResultsController: resultsViewController)
    searchController?.searchResultsUpdater = resultsViewController

    // Put the search bar in the navigation bar.
    searchController?.searchBar.sizeToFit()
    navigationItem.titleView = searchController?.searchBar

    // When UISearchController presents the results view, present it in
    // this view controller, not one further up the chain.
    definesPresentationContext = true

    // Prevent the navigation bar from being hidden when searching.
    searchController?.hidesNavigationBarDuringPresentation = false
  }
}

// Handle the user's selection.
extension ViewController: GMSAutocompleteResultsViewControllerDelegate {
  func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                         didAutocompleteWith place: GMSPlace) {
    searchController?.isActive = false
    // Do something with the selected place.
    print("Place name: \(place.name)")
    print("Place address: \(place.formattedAddress)")
    print("Place attributions: \(place.attributions)")
  }

  func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                         didFailAutocompleteWithError error: Error){
    // TODO: handle the error.
    print("Error: ", error.localizedDescription)
  }

  // Turn the network activity indicator on and off again.
  func didRequestAutocompletePredictions(_ viewController: GMSAutocompleteViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = true
  }

  func didUpdateAutocompletePredictions(_ viewController: GMSAutocompleteViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = false
  }
}

Objective-C

- (void)viewDidLoad {
  _resultsViewController = [[GMSAutocompleteResultsViewController alloc] init];
  _resultsViewController.delegate = self;

  _searchController = [[UISearchController alloc]
                       initWithSearchResultsController:_resultsViewController];
  _searchController.searchResultsUpdater = _resultsViewController;

  // Put the search bar in the navigation bar.
  [_searchController.searchBar sizeToFit];
  self.navigationItem.titleView = _searchController.searchBar;

  // When UISearchController presents the results view, present it in
  // this view controller, not one further up the chain.
  self.definesPresentationContext = YES;

  // Prevent the navigation bar from being hidden when searching.
  _searchController.hidesNavigationBarDuringPresentation = NO;
}

// Handle the user's selection.
- (void)resultsController:(GMSAutocompleteResultsViewController *)resultsController
  didAutocompleteWithPlace:(GMSPlace *)place {
    _searchController.active = NO;
    // Do something with the selected place.
    NSLog(@"Place name %@", place.name);
    NSLog(@"Place address %@", place.formattedAddress);
    NSLog(@"Place attributions %@", place.attributions.string);
}

- (void)resultsController:(GMSAutocompleteResultsViewController *)resultsController
didFailAutocompleteWithError:(NSError *)error {
  [self dismissViewControllerAnimated:YES completion:nil];
  // TODO: handle the error.
  NSLog(@"Error: %@", [error description]);
}

// Turn the network activity indicator on and off again.
- (void)didRequestAutocompletePredictionsForResultsController:
    (GMSAutocompleteResultsViewController *)resultsController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

- (void)didUpdateAutocompletePredictionsForResultsController:
    (GMSAutocompleteResultsViewController *)resultsController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

Adding a search bar to the top of a view

The following code example shows adding the searchBar to the top of a view.

Swift

import UIKit
import GooglePlaces

class ViewController: UIViewController {

  var resultsViewController: GMSAutocompleteResultsViewController?
  var searchController: UISearchController?
  var resultView: UITextView?

  override func viewDidLoad() {
    super.viewDidLoad()

    resultsViewController = GMSAutocompleteResultsViewController()
    resultsViewController?.delegate = self

    searchController = UISearchController(searchResultsController: resultsViewController)
    searchController?.searchResultsUpdater = resultsViewController

    let subView = UIView(frame: CGRect(x: 0, y: 65.0, width: 350.0, height: 45.0))

    subView.addSubview((searchController?.searchBar)!)
    view.addSubview(subView)
    searchController?.searchBar.sizeToFit()
    searchController?.hidesNavigationBarDuringPresentation = false

    // When UISearchController presents the results view, present it in
    // this view controller, not one further up the chain.
    definesPresentationContext = true
  }
}

// Handle the user's selection.
extension ViewController: GMSAutocompleteResultsViewControllerDelegate {
  func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                         didAutocompleteWith place: GMSPlace) {
    searchController?.isActive = false
    // Do something with the selected place.
    print("Place name: \(place.name)")
    print("Place address: \(place.formattedAddress)")
    print("Place attributions: \(place.attributions)")
  }

  func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                         didFailAutocompleteWithError error: Error){
    // TODO: handle the error.
    print("Error: ", error.localizedDescription)
  }

  // Turn the network activity indicator on and off again.
  func didRequestAutocompletePredictions(forResultsController resultsController: GMSAutocompleteResultsViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = true
  }

  func didUpdateAutocompletePredictions(forResultsController resultsController: GMSAutocompleteResultsViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = false
  }
}

Objective-C

- (void)viewDidLoad {
    [super viewDidLoad];

    _resultsViewController = [[GMSAutocompleteResultsViewController alloc] init];
    _resultsViewController.delegate = self;

    _searchController = [[UISearchController alloc]
                             initWithSearchResultsController:_resultsViewController];
    _searchController.searchResultsUpdater = _resultsViewController;

    UIView *subView = [[UIView alloc] initWithFrame:CGRectMake(0, 65.0, 250, 50)];

    [subView addSubview:_searchController.searchBar];
    [_searchController.searchBar sizeToFit];
    [self.view addSubview:subView];

    // When UISearchController presents the results view, present it in
    // this view controller, not one further up the chain.
    self.definesPresentationContext = YES;
}

// Handle the user's selection.
- (void)resultsController:(GMSAutocompleteResultsViewController *)resultsController
didAutocompleteWithPlace:(GMSPlace *)place {
  [self dismissViewControllerAnimated:YES completion:nil];
  // Do something with the selected place.
  NSLog(@"Place name %@", place.name);
  NSLog(@"Place address %@", place.formattedAddress);
  NSLog(@"Place attributions %@", place.attributions.string);
}

- (void)resultsController:(GMSAutocompleteResultsViewController *)resultsController
didFailAutocompleteWithError:(NSError *)error {
  [self dismissViewControllerAnimated:YES completion:nil];
  // TODO: handle the error.
  NSLog(@"Error: %@", [error description]);
}

// Turn the network activity indicator on and off again.
- (void)didRequestAutocompletePredictionsForResultsController:
    (GMSAutocompleteResultsViewController *)resultsController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

- (void)didUpdateAutocompletePredictionsForResultsController:
    (GMSAutocompleteResultsViewController *)resultsController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

By default, UISearchController hides the navigation bar when presenting (this can be disabled). In cases where the navigation bar is visible and opaque, UISearchController does not set the placement correctly.

Use the following code as a workaround:

Swift

navigationController?.navigationBar.translucent = false
searchController?.hidesNavigationBarDuringPresentation = false

// This makes the view area include the nav bar even though it is opaque.
// Adjust the view placement down.
self.extendedLayoutIncludesOpaqueBars = true
self.edgesForExtendedLayout = .top

Objective-C

self.navigationController.navigationBar.translucent = NO;
_searchController.hidesNavigationBarDuringPresentation = NO;

// This makes the view area include the nav bar even though it is opaque.
// Adjust the view placement down.
self.extendedLayoutIncludesOpaqueBars = YES;
self.edgesForExtendedLayout = UIRectEdgeTop;

The following code example shows placing a search bar on the right side of the navigation bar, and displaying results in a popover.

Swift

import UIKit
import GooglePlaces

class ViewController: UIViewController {

  var resultsViewController: GMSAutocompleteResultsViewController?
  var searchController: UISearchController?
  var resultView: UITextView?

  override func viewDidLoad() {
    super.viewDidLoad()

    resultsViewController = GMSAutocompleteResultsViewController()
    resultsViewController?.delegate = self

    searchController = UISearchController(searchResultsController: resultsViewController)
    searchController?.searchResultsUpdater = resultsViewController

    // Add the search bar to the right of the nav bar,
    // use a popover to display the results.
    // Set an explicit size as we don't want to use the entire nav bar.
    searchController?.searchBar.frame = (CGRect(x: 0, y: 0, width: 250.0, height: 44.0))
    navigationItem.rightBarButtonItem = UIBarButtonItem(customView: (searchController?.searchBar)!)

    // When UISearchController presents the results view, present it in
    // this view controller, not one further up the chain.
    definesPresentationContext = true

    // Keep the navigation bar visible.
    searchController?.hidesNavigationBarDuringPresentation = false
    searchController?.modalPresentationStyle = .popover
  }
}
// Handle the user's selection.
extension ViewController: GMSAutocompleteResultsViewControllerDelegate {
  func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                         didAutocompleteWith place: GMSPlace) {
    searchController?.isActive = false
    // Do something with the selected place.
    print("Place name: \(place.name)")
    print("Place address: \(place.formattedAddress)")
    print("Place attributions: \(place.attributions)")
  }

  func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                         didFailAutocompleteWithError error: Error){
    // TODO: handle the error.
    print("Error: ", error.localizedDescription)
  }

  // Turn the network activity indicator on and off again.
  func didRequestAutocompletePredictions(forResultsController resultsController: GMSAutocompleteResultsViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = true
  }

  func didUpdateAutocompletePredictions(forResultsController resultsController: GMSAutocompleteResultsViewController) {
    UIApplication.shared.isNetworkActivityIndicatorVisible = false
  }
}

Objective-C

- (void)viewDidLoad {
  [super viewDidLoad];

  _resultsViewController = [[GMSAutocompleteResultsViewController alloc] init];
  _resultsViewController.delegate = self;

  _searchController = [[UISearchController alloc]
                           initWithSearchResultsController:_resultsViewController];
  _searchController.searchResultsUpdater = _resultsViewController;

  // Add the search bar to the right of the nav bar,
  // use a popover to display the results.
  // Set an explicit size as we don't want to use the entire nav bar.
  _searchController.searchBar.frame = CGRectMake(0, 0, 250.0f, 44.0f);
  self.navigationItem.rightBarButtonItem =
  [[UIBarButtonItem alloc] initWithCustomView:_searchController.searchBar];

  // When UISearchController presents the results view, present it in
  // this view controller, not one further up the chain.
  self.definesPresentationContext = YES;

  // Keep the navigation bar visible.
  _searchController.hidesNavigationBarDuringPresentation = NO;

  _searchController.modalPresentationStyle = UIModalPresentationPopover;
}

// Handle the user's selection.
- (void)resultsController:(GMSAutocompleteResultsViewController *)resultsController
didAutocompleteWithPlace:(GMSPlace *)place {
  [self dismissViewControllerAnimated:YES completion:nil];
  NSLog(@"Place name %@", place.name);
  NSLog(@"Place address %@", place.formattedAddress);
  NSLog(@"Place attributions %@", place.attributions.string);
}

- (void)resultsController:(GMSAutocompleteResultsViewController *)resultsController
didFailAutocompleteWithError:(NSError *)error {
  [self dismissViewControllerAnimated:YES completion:nil];
  // TODO: handle the error.
  NSLog(@"Error: %@", [error description]);
}

// Turn the network activity indicator on and off again.
- (void)didRequestAutocompletePredictionsForResultsController:
    (GMSAutocompleteResultsViewController *)resultsController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

- (void)didUpdateAutocompletePredictionsForResultsController:
    (GMSAutocompleteResultsViewController *)resultsController {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

Using a table data source

If your app has a custom search text UI, you can use the GMSAutocompleteTableDataSource class to drive the table view displaying the results on the view controller.

To use GMSAutocompleteTableDataSource as the data source and delegate of the UITableView in a view controller:

Implement the GMSAutocompleteTableDataSourceDelegate and UISearchBarDelegate protocols in the view controller.
Create a GMSAutocompleteTableDataSource instance and assign the view controller as the delegate property.
Set the GMSAutocompleteTableDataSource as the datasource and delegate properties of the UITableView instance on the view controller.
In the handler for the search text input, call sourceTextHasChanged on the GMSAutocompleteTableDataSource.
Handle the user's selection in the didAutocompleteWithPlace delegate method.
Dismiss the controller in the didAutocompleteWithPlace, didFailAutocompleteWithError, wasCancelled delegate methods.

The following code example demonstrates using the GMSAutocompleteTableDataSource class to drive the table view of a UIViewController when the UISearchBar is added separately.

Swift

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import GooglePlaces
import UIKit

class PlaceAutocompleteViewController: UIViewController {

  private var tableView: UITableView!
  private var tableDataSource: GMSAutocompleteTableDataSource!

  override func viewDidLoad() {
    super.viewDidLoad()

    let searchBar = UISearchBar(frame: CGRect(x: 0, y: 20, width: self.view.frame.size.width, height: 44.0))
    searchBar.delegate = self
    view.addSubview(searchBar)

    tableDataSource = GMSAutocompleteTableDataSource()
    tableDataSource.delegate = self

    tableView = UITableView(frame: CGRect(x: 0, y: 64, width: self.view.frame.size.width, height: self.view.frame.size.height - 44))
    tableView.delegate = tableDataSource
    tableView.dataSource = tableDataSource

    view.addSubview(tableView)
  }
}

extension PlaceAutocompleteViewController: UISearchBarDelegate {
  func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    // Update the GMSAutocompleteTableDataSource with the search text.
    tableDataSource.sourceTextHasChanged(searchText)
  }
}

extension PlaceAutocompleteViewController: GMSAutocompleteTableDataSourceDelegate {
  func didUpdateAutocompletePredictions(for tableDataSource: GMSAutocompleteTableDataSource) {
    // Turn the network activity indicator off.
    UIApplication.shared.isNetworkActivityIndicatorVisible = false
    // Reload table data.
    tableView.reloadData()
  }

  func didRequestAutocompletePredictions(for tableDataSource: GMSAutocompleteTableDataSource) {
    // Turn the network activity indicator on.
    UIApplication.shared.isNetworkActivityIndicatorVisible = true
    // Reload table data.
    tableView.reloadData()
  }

  func tableDataSource(_ tableDataSource: GMSAutocompleteTableDataSource, didAutocompleteWith place: GMSPlace) {
    // Do something with the selected place.
    print("Place name: \(place.name)")
    print("Place address: \(place.formattedAddress)")
    print("Place attributions: \(place.attributions)")
  }

  func tableDataSource(_ tableDataSource: GMSAutocompleteTableDataSource, didFailAutocompleteWithError error: Error) {
    // Handle the error.
    print("Error: \(error.localizedDescription)")
  }

  func tableDataSource(_ tableDataSource: GMSAutocompleteTableDataSource, didSelect prediction: GMSAutocompletePrediction) -> Bool {
    return true
  }
}

Objective-C

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#import "PlaceAutocompleteViewController.h"
@import GooglePlaces;
@import UIKit;

@interface PlaceAutocompleteViewController () <GMSAutocompleteTableDataSourceDelegate, UISearchBarDelegate>

@end

@implementation PlaceAutocompleteViewController {
  UITableView *tableView;
  GMSAutocompleteTableDataSource *tableDataSource;
}

- (void)viewDidLoad {
  [super viewDidLoad];

  UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, 44)];
  searchBar.delegate = self;

  [self.view addSubview:searchBar];

  tableDataSource = [[GMSAutocompleteTableDataSource alloc] init];
  tableDataSource.delegate = self;

  tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height - 44)];
  tableView.delegate = tableDataSource;
  tableView.dataSource = tableDataSource;

  [self.view addSubview:tableView];
}

#pragma mark - GMSAutocompleteTableDataSourceDelegate

- (void)didUpdateAutocompletePredictionsForTableDataSource:(GMSAutocompleteTableDataSource *)tableDataSource {
  // Turn the network activity indicator off.
  UIApplication.sharedApplication.networkActivityIndicatorVisible = NO;

  // Reload table data.
  [tableView reloadData];
}

- (void)didRequestAutocompletePredictionsForTableDataSource:(GMSAutocompleteTableDataSource *)tableDataSource {
  // Turn the network activity indicator on.
  UIApplication.sharedApplication.networkActivityIndicatorVisible = YES;

  // Reload table data.
  [tableView reloadData];
}

- (void)tableDataSource:(GMSAutocompleteTableDataSource *)tableDataSource didAutocompleteWithPlace:(GMSPlace *)place {
  // Do something with the selected place.
  NSLog(@"Place name: %@", place.name);
  NSLog(@"Place address: %@", place.formattedAddress);
  NSLog(@"Place attributions: %@", place.attributions);
}

- (void)tableDataSource:(GMSAutocompleteTableDataSource *)tableDataSource didFailAutocompleteWithError:(NSError *)error {
  // Handle the error
  NSLog(@"Error %@", error.description);
}

- (BOOL)tableDataSource:(GMSAutocompleteTableDataSource *)tableDataSource didSelectPrediction:(GMSAutocompletePrediction *)prediction {
  return YES;
}

#pragma mark - UISearchBarDelegate

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
  // Update the GMSAutocompleteTableDataSource with the search text.
  [tableDataSource sourceTextHasChanged:searchText];
}

@end

Customizing text and background colors

You can set the colors of all text and backgrounds in the autocomplete UI control, to make the widget match the visual appearance of your app more closely. There are two ways to set the UI control colors:

By using the native iOS UIAppearance protocol to globally style UI controls where possible. These settings apply to many, but not all, of the UI control elements.
By using the SDK methods on the widget classes to set properties which are not supported by the UIAppearance protocol.

Typically, your app will use some combination of the UIAppearance protocol and the SDK methods. The following diagram shows which elements can be styled:

Autocomplete UI control colors

The following table lists all of the UI elements, and indicates how each one should be styled (UIAppearance protocol or SDK method).

UI Element	Method	How to style
Navigation Bar tint (background)	UIAppearance protocol	Call `setBarTintColor` on `UINavigationBar` proxy.
Navigation Bar tint color (search bar text caret and Cancel button)	UIAppearance protocol	Call `setTintColor` on `UINavigationBar` proxy.
Search Bar text color	UIAppearance protocol	Set `NSForegroundColorAttributeName` in `searchBarTextAttributes`.
Search bar tint color	N/A	The search bar is translucent, and will display as a shaded version of the Navigation Bar.
Search bar placeholder text color (default search text)	UIAppearance protocol	Set `NSForegroundColorAttributeName` in `placeholderAttributes`.
Primary text (also applied to error and message text)	SDK method	Call `primaryTextColor`.
Primary text highlight	SDK method	Call `primaryTextHighlightColor`.
Secondary text	SDK method	Call `secondaryTextColor`.
Error and message text	SDK method	Call `primaryTextColor`.
Table cell background	SDK method	Call `tableCellBackgroundColor`.
Table cell separator color	SDK method	Call `tableCellSeparatorColor`.
"Try Again" button	SDK method	Call `tintColor`.
Activity indicator (progress spinner)	UIAppearance protocol	Call `setColor` on `UIActivityIndicatorView` proxy.
"Powered by Google" logo, Sad cloud image	N/A	White or gray version is automatically selected based on background contrast.
Magnifying glass and clear text icons in Search Bar text field	N/A	To style, replace the default images with images of the desired color.

Using the UIAppearance protocol

You can use the UIAppearance protocol to get the appearance proxy for a given UI element, which you can then use to set the color for the UI element. When a modification is made, all instances of a given UI element are affected. For example, the following example globally changes the text color of UITextField classes to green when they are contained in a UISearchBar:

[[UITextField appearanceWhenContainedIn:[UISearchBar class], nil]
    setDefaultTextAttributes:@{NSForegroundColorAttributeName:[UIColor greenColor]}];

For more information about defining color values, consult the UIColor Class Reference.

The following code snippets show all of the proxy commands you need to use to style everything in the full-screen autocomplete UI control. Add this code to the didFinishLaunchingWithOptions method in Appdelegate.m:

// Define some colors.
UIColor *darkGray = [UIColor darkGrayColor];
UIColor *lightGray = [UIColor lightGrayColor];

// Navigation bar background.
[[UINavigationBar appearance] setBarTintColor:darkGray];
[[UINavigationBar appearance] setTintColor:lightGray];

// Color of typed text in the search bar.
NSDictionary *searchBarTextAttributes = @{
                                          NSForegroundColorAttributeName: lightGray,
                                          NSFontAttributeName : [UIFont systemFontOfSize:[UIFont systemFontSize]]
                                          };
[UITextField appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]]
    .defaultTextAttributes = searchBarTextAttributes;

// Color of the placeholder text in the search bar prior to text entry.
NSDictionary *placeholderAttributes = @{
                                        NSForegroundColorAttributeName: lightGray,
                                        NSFontAttributeName : [UIFont systemFontOfSize:[UIFont systemFontSize]]
                                        };

// Color of the default search text.
// NOTE: In a production scenario, "Search" would be a localized string.
NSAttributedString *attributedPlaceholder =
[[NSAttributedString alloc] initWithString:@"Search"
                                attributes:placeholderAttributes];
[UITextField appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]]
    .attributedPlaceholder = attributedPlaceholder;

// Color of the in-progress spinner.
[[UIActivityIndicatorView appearance] setColor:lightGray];

// To style the two image icons in the search bar (the magnifying glass
// icon and the 'clear text' icon), replace them with different images.
[[UISearchBar appearance] setImage:[UIImage imageNamed:@"custom_clear_x_high"]
                  forSearchBarIcon:UISearchBarIconClear
                            state:UIControlStateHighlighted];
[[UISearchBar appearance] setImage:[UIImage imageNamed:@"custom_clear_x"]
                  forSearchBarIcon:UISearchBarIconClear
                            state:UIControlStateNormal];
[[UISearchBar appearance] setImage:[UIImage imageNamed:@"custom_search"]
                    forSearchBarIcon:UISearchBarIconSearch
                            state:UIControlStateNormal];

// Color of selected table cells.
UIView *selectedBackgroundView = [[UIView alloc] init];
selectedBackgroundView.backgroundColor = [UIColor lightGrayColor];
[UITableViewCell appearanceWhenContainedIn:[GMSAutocompleteViewController class], nil]
    .selectedBackgroundView = selectedBackgroundView;

Setting UI control style properties

A subset of UI control elements have properties that are not affected by the UIAppearance protocol, and so must be set directly. The following code example shows defining foreground and background colors, and applying them to a UI control instance named acController. Add this code to the onLaunchClicked method in ViewController.m:

UIColor *darkGray = [UIColor darkGrayColor];
UIColor *lightGray = [UIColor lightGrayColor];

acController.secondaryTextColor = [UIColor colorWithWhite:1.0f alpha:0.5f];
acController.primaryTextColor = lightGray;
acController.primaryTextHighlightColor = [UIColor grayColor];
acController.tableCellBackgroundColor = darkGray;
acController.tableCellSeparatorColor = lightGray;
acController.tintColor = lightGray;

Getting place predictions programmatically

You can create a custom search UI as an alternative to the UI provided by the autocomplete widget. To do this, your app must get place predictions programmatically. Your app can get a list of predicted place names and/or addresses in one of the following ways:

Call GMSPlacesClient findAutocompletePredictionsFromQuery:
Use the fetcher

Calling `GMSPlacesClient findAutocompletePredictionsFromQuery:`

To get a list of predicted place names and/or addresses, first instantiate GMSPlacesClient, then call the GMSPlacesClient findAutocompletePredictionsFromQuery: method with the following parameters:

An autocompleteQuery string containing the text typed by the user.
A GMSAutocompleteSessionToken, which is used to identify each individual session. Your app should pass the same token for each autocomplete request call, then pass that token, along with a Place ID, in the subsequent call to fetchPlacefromPlaceID: to retrieve Place Details for the place that was selected by the user.
A GMSAutocompleteFilter to:
- Bias or restrict the results to a specific region.
- Restrict the results to a specific type of place.
- A GMSPlaceLocationBias/Restriction object biasing the results to a specific area specified by latitude and longitude bounds.
A callback method to handle the returned predictions.

The code examples below show a call to findAutocompletePredictionsFromQuery:.

Swift

/**
 * Create a new session token. Be sure to use the same token for calling
 * findAutocompletePredictions, as well as the subsequent place details request.
 * This ensures that the user's query and selection are billed as a single session.
 */
let token = GMSAutocompleteSessionToken.init()

// Create a type filter.
let filter = GMSAutocompleteFilter()
filter.types = [.bank] 
filter.locationBias = GMSPlaceRectangularLocationOption( northEastBounds,
                                   southWestBounds);

placesClient?.findAutocompletePredictions(fromQuery: "cheesebu",

                                          filter: filter,
                                          sessionToken: token,
                                          callback: { (results, error) in
    if let error = error {
      print("Autocomplete error: \(error)")
      return
    }
    if let results = results {
      for result in results {
        print("Result \(result.attributedFullText) with placeID \(result.placeID)")
      }
    }
})

Objective-C

/**
 * Create a new session token. Be sure to use the same token for calling
 * findAutocompletePredictionsFromQuery:, as well as the subsequent place details request.
 * This ensures that the user's query and selection are billed as a single session.
 */
GMSAutocompleteSessionToken *token = [[GMSAutocompleteSessionToken alloc] init];

// Create a type filter.
GMSAutocompleteFilter *_filter = [[GMSAutocompleteFilter alloc] init];
_filter.types = @[ kGMSPlaceTypeBank ];

[_placesClient findAutocompletePredictionsFromQuery:@"cheesebu"
filter:_filter sessionToken:token callback:^(NSArray<GMSAutocompletePrediction *> * _Nullable results, NSError * _Nullable error) {
  if (error != nil) {
    NSLog(@"An error occurred %@", [error localizedDescription]);
    return;
  }
  if (results != nil) {
    for (GMSAutocompletePrediction *result in results) {
      NSLog(@"Result %@ with PlaceID %@", result.attributedFullText, result.placeID);
    }
  }
}];

The API invokes the specified callback method, passing in an array of GMSAutocompletePrediction objects.

Each GMSAutocompletePrediction object contains the following information:

attributedFullText – The full text of the prediction, in the form of an NSAttributedString. For example, 'Sydney Opera House, Sydney, New South Wales, Australia'. Every text range that matches the user input has an attribute, kGMSAutocompleteMatchAttribute. You can use this attribute to highlight the matching text in the user's query, for example, as shown below.
placeID – The place ID of the predicted place. A place ID is a textual identifier that uniquely identifies a place. For more information about place IDs, see the Place ID overview.
distanceMeters – The straight-line distance from the specified origin to the destination. If the origin property is not set, no distance value will be returned.

The following code example illustrates how to highlight in bold text the parts of the result that match text in the user's query, using enumerateAttribute:

Swift

let regularFont = UIFont.systemFont(ofSize: UIFont.labelFontSize)
let boldFont = UIFont.boldSystemFont(ofSize: UIFont.labelFontSize)

let bolded = prediction.attributedFullText.mutableCopy() as! NSMutableAttributedString
bolded.enumerateAttribute(kGMSAutocompleteMatchAttribute, in: NSMakeRange(0, bolded.length), options: []) {
  (value, range: NSRange, stop: UnsafeMutablePointer<ObjCBool>) -> Void in
    let font = (value == nil) ? regularFont : boldFont
    bolded.addAttribute(NSFontAttributeName, value: font, range: range)
}

label.attributedText = bolded

Objective-C

UIFont *regularFont = [UIFont systemFontOfSize:[UIFont labelFontSize]];
UIFont *boldFont = [UIFont boldSystemFontOfSize:[UIFont labelFontSize]];

NSMutableAttributedString *bolded = [prediction.attributedFullText mutableCopy];
[bolded enumerateAttribute:kGMSAutocompleteMatchAttribute
                   inRange:NSMakeRange(0, bolded.length)
                   options:0
                usingBlock:^(id value, NSRange range, BOOL *stop) {
                  UIFont *font = (value == nil) ? regularFont : boldFont;
                  [bolded addAttribute:NSFontAttributeName value:font range:range];
                }];

label.attributedText = bolded;

Using the fetcher

If you want to build your own autocomplete control from scratch, you can use GMSAutocompleteFetcher, which wraps the autocompleteQuery method on GMSPlacesClient. The fetcher throttles requests, returning only results for the most recently entered search text. It provides no UI elements.

To implement GMSAutocompleteFetcher, take the following steps:

Implement the GMSAutocompleteFetcherDelegate protocol.
Create a GMSAutocompleteFetcher object.
Call sourceTextHasChanged on the fetcher as the user types.
Handle predictions and errors using the didAutcompleteWithPredictions and didFailAutocompleteWithError protocol methods.

The following code example demonstrates using the fetcher to take user input and display place matches in a text view. Functionality for selecting a place has been omitted. FetcherSampleViewController derives from UIViewController in FetcherSampleViewController.h.

Swift

import UIKit
import GooglePlaces

class ViewController: UIViewController {

  var textField: UITextField?
  var resultText: UITextView?
  var fetcher: GMSAutocompleteFetcher?

  override func viewDidLoad() {
    super.viewDidLoad()

    view.backgroundColor = .white
    edgesForExtendedLayout = []

    // Set bounds to inner-west Sydney Australia.
    let neBoundsCorner = CLLocationCoordinate2D(latitude: -33.843366,
                                                longitude: 151.134002)
    let swBoundsCorner = CLLocationCoordinate2D(latitude: -33.875725,
                                                longitude: 151.200349)

    // Set up the autocomplete filter.
    let filter = GMSAutocompleteFilter()
    filter.locationRestriction = GMSPlaceRectangularLocationOption(neBoundsCorner, swBoundsCorner)

    // Create a new session token.
    let token: GMSAutocompleteSessionToken = GMSAutocompleteSessionToken.init()

    // Create the fetcher.
    fetcher = GMSAutocompleteFetcher(bounds: nil, filter: filter)
    fetcher?.delegate = self
    fetcher?.provide(token)

    textField = UITextField(frame: CGRect(x: 5.0, y: 10.0,
                                          width: view.bounds.size.width - 5.0,
                                          height: 64.0))
    textField?.autoresizingMask = .flexibleWidth
    textField?.addTarget(self, action: #selector(textFieldDidChange(textField:)),
                         for: .editingChanged)
    let placeholder = NSAttributedString(string: "Type a query...")

    textField?.attributedPlaceholder = placeholder

    resultText = UITextView(frame: CGRect(x: 0, y: 65.0,
                                          width: view.bounds.size.width,
                                          height: view.bounds.size.height - 65.0))
    resultText?.backgroundColor = UIColor(white: 0.95, alpha: 1.0)
    resultText?.text = "No Results"
    resultText?.isEditable = false

    self.view.addSubview(textField!)
    self.view.addSubview(resultText!)
  }

  @objc func textFieldDidChange(textField: UITextField) {
    fetcher?.sourceTextHasChanged(textField.text!)
  }

}

extension ViewController: GMSAutocompleteFetcherDelegate {
  func didAutocomplete(with predictions: [GMSAutocompletePrediction]) {
    let resultsStr = NSMutableString()
    for prediction in predictions {
      resultsStr.appendFormat("\n Primary text: %@\n", prediction.attributedPrimaryText)
      resultsStr.appendFormat("Place ID: %@\n", prediction.placeID)
    }

    resultText?.text = resultsStr as String
  }

  func didFailAutocompleteWithError(_ error: Error) {
    resultText?.text = error.localizedDescription
  }
}

Objective-C

#import "FetcherSampleViewController.h"
#import <GooglePlaces/GooglePlaces.h>

@interface FetcherSampleViewController () <GMSAutocompleteFetcherDelegate>

@end

@implementation FetcherSampleViewController {
  UITextField *_textField;
  UITextView *_resultText;
  GMSAutocompleteFetcher* _fetcher;
}

- (void)viewDidLoad {
  [super viewDidLoad];

  self.view.backgroundColor = [UIColor whiteColor];
  self.edgesForExtendedLayout = UIRectEdgeNone;

  // Set bounds to inner-west Sydney Australia.
  CLLocationCoordinate2D neBoundsCorner = CLLocationCoordinate2DMake(-33.843366, 151.134002);
  CLLocationCoordinate2D swBoundsCorner = CLLocationCoordinate2DMake(-33.875725, 151.200349);

  GMSAutocompleteFilter *autocompleteFilter = [[GMSAutocompleteFilter alloc] init];
  autocompleteFilter.locationRestriction =
        GMSPlaceRectangularLocationOption(neBoundsCorner, swBoundsCorner);

  // Create the fetcher.
  _fetcher = [[GMSAutocompleteFetcher alloc] initWithBounds:nil
                                                     filter:filter];
  _fetcher.delegate = self;

  // Set up the UITextField and UITextView.
  _textField = [[UITextField alloc] initWithFrame:CGRectMake(5.0f,
                                                             0,
                                                             self.view.bounds.size.width - 5.0f,
                                                             44.0f)];
  _textField.autoresizingMask = UIViewAutoresizingFlexibleWidth;
  [_textField addTarget:self
                 action:@selector(textFieldDidChange:)
       forControlEvents:UIControlEventEditingChanged];
  _resultText =[[UITextView alloc] initWithFrame:CGRectMake(0,
                                                            45.0f,
                                                            self.view.bounds.size.width,
                                                            self.view.bounds.size.height - 45.0f)];
  _resultText.backgroundColor = [UIColor colorWithWhite:0.95f alpha:1.0f];
  _resultText.text = @"No Results";
  _resultText.editable = NO;
  [self.view addSubview:_textField];
  [self.view addSubview:_resultText];
}

- (void)textFieldDidChange:(UITextField *)textField {
  NSLog(@"%@", textField.text);
  [_fetcher sourceTextHasChanged:textField.text];
}

#pragma mark - GMSAutocompleteFetcherDelegate
- (void)didAutocompleteWithPredictions:(NSArray *)predictions {
  NSMutableString *resultsStr = [NSMutableString string];
  for (GMSAutocompletePrediction *prediction in predictions) {
      [resultsStr appendFormat:@"%@\n", [prediction.attributedPrimaryText string]];
  }
  _resultText.text = resultsStr;
}

- (void)didFailAutocompleteWithError:(NSError *)error {
  _resultText.text = [NSString stringWithFormat:@"%@", error.localizedDescription];
}

@end

Session tokens

Session tokens group the query and selection phases of a user autocomplete search into a discrete session for billing purposes. The session begins when the user starts typing a query, and concludes when they select a place. Each session can have multiple queries, followed by one place selection. Once a session has concluded, the token is no longer valid; your app must generate a fresh token for each session. We recommend using session tokens for all programmatic autocomplete sessions (when you use the full-screen controller, or the results controller, the API takes care of this automatically).

The Places SDK for iOS uses a GMSAutocompleteSessionToken to identify each session. Your app should pass a new session token upon beginning each new session, then pass that same token, along with a Place ID, in the subsequent call to fetchPlacefromPlaceID: to retrieve Place Details for the place that was selected by the user.

Learn more about session tokens.

Use the following code to generate a new session token:

let token: GMSAutocompleteSessionToken = GMSAutocompleteSessionToken.init()

Usage limits

Use of the GMSPlacesClient findAutocompletePredictionsFromQuery method is subject to tiered query limits. See the documentation on usage limits.

Displaying attributions in your app

If your app uses the autocomplete service programmatically, your UI must either display a 'Powered by Google' attribution, or appear within a Google-branded map.
If your app uses the autocomplete UI control no additional action is required (the required attribution is displayed by default).
If you retrieve and display additional place information after getting a place by ID, you must display third-party attributions too.

For more details, see the documentation on attributions.

Controlling the network activity indicator

To control the network activity indicator in the applications status bar you must implement the appropriate optional delegate methods for the autocomplete class you are using and turn the network indicator on and off yourself.

For GMSAutocompleteViewController you must implement the delegate methods didRequestAutocompletePredictions: and didUpdateAutocompletePredictions:.
For GMSAutocompleteResultsViewController you must implement the delegate methods didRequestAutocompletePredictionsForResultsController: and didUpdateAutocompletePredictionsForResultsController:.
For GMSAutocompleteTableDataSource you must implement the delegate methods didRequestAutocompletePredictionsForTableDataSource: and didUpdateAutocompletePredictionsForTableDataSource:.

By implementing these methods and setting [UIApplication sharedApplication].networkActivityIndicatorVisible to YES and NO respectively the status bar will correctly match the autocomplete UI.

Constrain autocomplete results

You can set the autocomplete UI control to constrain results to a specific geographic region, and/or filter the results to one or more place types, or to a specific country or countries. To constrain results, you can do the following:

To prefer (bias) results within the defined region, set locationBias on the GMSAutocompleteFilter (some results from outside the defined region may still be returned). If locationRestriction is also set, locationBias will be ignored.
To only show (restrict) results within the defined region, set locationRestriction on the GMSAutocompleteFilter (only results within the defined region will be returned).
- Note: This restriction is only applied to entire routes, synthetic results located outside the rectangular bounds may be returned based on a route that overlaps with the location restrict.
To return only results that conform to a particular place type, set types on the GMSAutocompleteFilter, (for example, specifying TypeFilter.ADDRESS will cause the widget to return only results with a precise address).
To return only results within up to five specified countries, set countries on the GMSAutocompleteFilter.

Bias results to a specific region

To prefer (bias) results within the defined region, set locationBias on the GMSAutocompleteFilter, as shown here:

  northEast = CLLocationCoordinate2DMake(39.0, -95.0);
  southWest = CLLocationCoordinate2DMake(37.5, -100.0);
  GMSAutocompleteFilter *filter = [[GMSAutocompleteFilter alloc] init];
  filter.locationBias = GMSPlaceRectangularLocationOption(northEast, southWest);

Restrict results to a specific region

To only show (restrict) results within the defined region, set locationRestriction on the GMSAutocompleteFilter, as shown here:

  northEast = CLLocationCoordinate2DMake(39.0, -95.0);
  southWest = CLLocationCoordinate2DMake(37.5, -100.0);
  GMSAutocompleteFilter *filter = [[GMSAutocompleteFilter alloc] init];
  filter.locationRestriction = GMSPlaceRectangularLocationOption(northEast, southWest);

Filter results by country

To filter results within up to five specified countries, set countries on the GMSAutocompleteFilter, as shown here:

  GMSAutocompleteFilter *filter = [[GMSAutocompleteFilter alloc] init];
  filter.countries = @[ @"au", @"nz" ];

Filter results by place type or type collection

Restrict results to be of a certain type or type collection by setting the types property of GMSAutoCompleteFilter. Use this property to specify filters listed in Tables 1, 2, and 3 on Place Types. If nothing is specified, all types are returned.

To specify a type or type collection filter:

Use the types property to specify up to five type values from Table 1 and Table 2 shown on Place Types. The type values are defined by the constants in GMSPlaceType.
Use the types property to specify a type collection from Table 3 shown on Place Types. The type collection values are defined by the constants in GMSPlaceType.

Only a single type from Table 3 is allowed in the request. If you specify a value from Table 3, you cannot specify a value from Table 1 or Table 2. If you do, then an error occurs.

For example, to return only results that conform to a particular place type, set types on the GMSAutocompleteFilter. The following example shows setting the filter to return only results with a precise address:

  GMSAutocompleteFilter *filter = [[GMSAutocompleteFilter alloc] init];
  filter.types = @[ kGMSPlaceTypeAirport, kGMSPlaceTypeAmusementPark ];

Place Autocomplete optimization

This section describes best practices to help you make the most of the Place Autocomplete service.

Here are some general guidelines:

The quickest way to develop a working user interface is to use the Maps JavaScript API Autocomplete widget, Places SDK for Android Autocomplete widget, or Places SDK for iOS Autocomplete UI control
Develop an understanding of essential Place Autocomplete data fields from the start.
Location biasing and location restriction fields are optional but can have a significant impact on autocomplete performance.
Use error handling to make sure your app degrades gracefully if the API returns an error.
Make sure your app handles when there is no selection and offers users a way to continue.

Cost optimization best practices

Basic cost optimization

To optimize the cost of using the Place Autocomplete service, use field masks in Place Details and Place Autocomplete widgets to return only the place data fields you need.

Advanced cost optimization

Consider programmatic implementation of Place Autocomplete in order to access Per Request pricing and request Geocoding API results about the selected place instead of Place Details. Per Request pricing paired with Geocoding API is more cost-effective than Per Session (session-based) pricing if both of the following conditions are met:

If you only need the latitude/longitude or address of the user's selected place, the Geocoding API delivers this information for less than a Place Details call.
If users select an autocomplete prediction within an average of four Autocomplete predictions requests or fewer, Per Request pricing may be more cost-effective than Per Session pricing.

For help selecting the Place Autocomplete implementation that fits your needs, select the tab that corresponds to your answer to the following question.

Does your application require any information other than the address and latitude/longitude of the selected prediction?

Yes, needs more details

Use session-based Place Autocomplete with Place Details.
Since your application requires Place Details such as the place name, business status, or opening hours, your implementation of Place Autocomplete should use a session token (programmatically or built into the JavaScript, Android, or iOS widgets) for a total cost of $0.017 per session plus applicable Places Data SKUs depending on which place data fields you request.¹

Widget implementation
Session management is automatically built into the JavaScript, Android, or iOS widgets. This includes both the Place Autocomplete requests and the Place Details request on the selected prediction. Be sure to specify the fields parameter in order to ensure you are only requesting the place data fields you need.

Programmatic implementation
Use a session token with your Place Autocomplete requests. When requesting Place Details about the selected prediction, include the following parameters:

The place ID from the Place Autocomplete response
The session token used in the Place Autocomplete request
The fields parameter specifying the place data fields you need

No, needs only address and location

Geocoding API could be a more cost-effective option than Place Details for your application, depending on the performance of your Place Autocomplete usage. Every application's Autocomplete efficiency varies depending on what users are entering, where the application is being used, and whether performance optimization best practices have been implemented.

In order to answer the following question, analyze how many characters a user types on average before selecting a Place Autocomplete prediction in your application.

Do your users select a Place Autocomplete prediction in four or fewer requests, on average?

Yes

Implement Place Autocomplete programmatically without session tokens and call Geocoding API on the selected place prediction.
Geocoding API delivers addresses and latitude/longitude coordinates for $0.005 per request. Making four Place Autocomplete - Per Request requests costs $0.01132 so the total cost of four requests plus a Geocoding API call about the selected place prediction would be $0.01632 which is less than the Per Session Autocomplete price of $0.017 per session.¹

Consider employing performance best practices to help your users get the prediction they're looking for in even fewer characters.

No

Use session-based Place Autocomplete with Place Details.
Since the average number of requests you expect to make before a user selects a Place Autocomplete prediction exceeds the cost of Per Session pricing, your implementation of Place Autocomplete should use a session token for both the Place Autocomplete requests and the associated Place Details request for a total cost of $0.017 per session.¹

Programmatic implementation
Use a session token with your Place Autocomplete requests. When requesting Place Details about the selected prediction, include the following parameters:

The place ID from the Place Autocomplete response
The session token used in the Place Autocomplete request
The fields parameter specifying Basic Data fields such as address and geometry

Consider delaying Place Autocomplete requests
You can employ strategies such as delaying a Place Autocomplete request until the user has typed in the first three or four characters so that your application makes fewer requests. For example, making Place Autocomplete requests for each character after the user has typed the third character means that if the user types seven characters then selects a prediction for which you make one Geocoding API request, the total cost would be $0.01632 (4 * $0.00283 Autocomplete Per Request + $0.005 Geocoding).¹

If delaying requests can get your average programmatic request below four, you can follow the guidance for performant Place Autocomplete with Geocoding API implementation. Note that delaying requests can be perceived as latency by the user who might be expecting to see predictions with every new keystroke.

Consider employing performance best practices to help your users get the prediction they're looking for in fewer characters.

Costs listed here are in USD. Please refer to the Google Maps Platform Billing page for full pricing information.

Performance best practices

The following guidelines describe ways to optimize Place Autocomplete performance:

Add country restrictions, location biasing, and (for programmatic implementations) language preference to your Place Autocomplete implementation. Language preference is not needed with widgets since they pick language preferences from the user's browser or mobile device.
If Place Autocomplete is accompanied by a map, you can bias location by map viewport.
In situations when a user does not choose one of the Autocomplete predictions, generally because none of those predictions are the desired result-address, you can re-use the original user input to attempt to get more relevant results:
- If you expect the user to enter only address information, re-use the original user input in a call to the Geocoding API.
- If you expect the user to enter queries for a specific place by name or address, use a Find Place request. If results are only expected in a specific region, use location biasing.
Other scenarios when it's best to fall back to the Geocoding API include:
- Users inputting subpremise addresses in countries where Place Autocomplete support of subpremise addresses is incomplete, e.g. Czechia, Estonia and Lithuania. For example, the Czech address "Stroupežnického 3191/17, Praha" yields a partial prediction in Place Autocomplete.
- Users inputting addresses with road-segment prefixes like "23-30 29th St, Queens" in New York City or "47-380 Kamehameha Hwy, Kaneohe" on the island of Kauai in Hawai'i.

Troubleshooting

Although a wide variety of errors can occur, the majority of the errors your app is likely to experience are usually caused by configuration errors (for example, the wrong API key was used, or the API key was configured incorrectly), or quota errors (your app has exceeded its quota). See Usage Limits for more information about quotas.

Errors that occur in the use of the autocomplete controls are returned in the didFailAutocompleteWithError() method of the various delegate protocols. The code property of the supplied NSError object is set to one of the values of the GMSPlacesErrorCode enumeration.

Place Autocomplete

Adding an autocomplete UI control

Adding a full-screen control

Swift

Objective-C

Adding a results controller

Adding a search bar to the navigation bar

Swift

Objective-C

Adding a search bar to the top of a view

Swift

Objective-C

Swift

Objective-C

Adding a search bar using popover results

Swift

Objective-C

Using a table data source

Swift

Objective-C

Customizing text and background colors

Using the UIAppearance protocol

Setting UI control style properties

Getting place predictions programmatically

Calling GMSPlacesClient findAutocompletePredictionsFromQuery:

Swift

Objective-C

Swift

Objective-C

Using the fetcher

Swift

Objective-C

Session tokens

Usage limits

Displaying attributions in your app

Controlling the network activity indicator

Constrain autocomplete results

Bias results to a specific region

Restrict results to a specific region

Filter results by country

Filter results by place type or type collection

Place Autocomplete optimization

Cost optimization best practices

Basic cost optimization

Advanced cost optimization

Yes, needs more details

No, needs only address and location

Yes

No

Performance best practices

Troubleshooting

Calling `GMSPlacesClient findAutocompletePredictionsFromQuery:`