地圖檢視畫面的右下角會顯示「我的位置」按鈕。使用者輕觸按鈕時,地圖會平移至使用者的目前位置。
開始使用
請務必先設定開發環境,再試用程式碼範例。詳情請參閱「Maps SDK for iOS 程式碼範例」一文。
查看程式碼
Swift
import GoogleMaps import UIKit class MyLocationViewController: UIViewController { private let cameraLatitude: CLLocationDegrees = -33.868 private let cameraLongitude: CLLocationDegrees = 151.2086 private let cameraZoom: Float = 12 lazy var mapView: GMSMapView = { let camera = GMSCameraPosition( latitude: cameraLatitude, longitude: cameraLongitude, zoom: cameraZoom) return GMSMapView(frame: .zero, camera: camera) }() var observation: NSKeyValueObservation? var location: CLLocation? { didSet { guard oldValue == nil, let firstLocation = location else { return } mapView.camera = GMSCameraPosition(target: firstLocation.coordinate, zoom: 14) } } override func viewDidLoad() { super.viewDidLoad() mapView.delegate = self mapView.settings.compassButton = true mapView.settings.myLocationButton = true mapView.isMyLocationEnabled = true view = mapView // Listen to the myLocation property of GMSMapView. observation = mapView.observe(\.myLocation, options: [.new]) { [weak self] mapView, _ in self?.location = mapView.myLocation } } deinit { observation?.invalidate() } } extension MyLocationViewController: GMSMapViewDelegate { func mapView(_ mapView: GMSMapView, didTapMyLocation location: CLLocationCoordinate2D) { let alert = UIAlertController( title: "Location Tapped", message: "Current location: <\(location.latitude), \(location.longitude)>", preferredStyle: .alert) alert.addAction(UIAlertAction(title: "OK", style: .default)) present(alert, animated: true) } }
Objective-C
#import "GoogleMapsDemos/Samples/MyLocationViewController.h" #import <GoogleMaps/GoogleMaps.h> @implementation MyLocationViewController { GMSMapView *_mapView; BOOL _firstLocationUpdate; } - (void)viewDidLoad { [super viewDidLoad]; GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-33.868 longitude:151.2086 zoom:12]; _mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera]; _mapView.delegate = self; _mapView.settings.compassButton = YES; _mapView.settings.myLocationButton = YES; // Listen to the myLocation property of GMSMapView. [_mapView addObserver:self forKeyPath:@"myLocation" options:NSKeyValueObservingOptionNew context:NULL]; self.view = _mapView; // Ask for My Location data after the map has already been added to the UI. GMSMapView *mapView = _mapView; dispatch_async(dispatch_get_main_queue(), ^{ mapView.myLocationEnabled = YES; }); } - (void)mapView:(GMSMapView *)mapView didTapMyLocation:(CLLocationCoordinate2D)location { NSString *message = [NSString stringWithFormat:@"My Location Dot Tapped at: [lat: %f, lng: %f]", location.latitude, location.longitude]; UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Location Tapped" message:message preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){ }]; [alertController addAction:okAction]; [self presentViewController:alertController animated:YES completion:nil]; } - (void)dealloc { [_mapView removeObserver:self forKeyPath:@"myLocation" context:NULL]; } #pragma mark - KVO updates - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if (!_firstLocationUpdate) { // If the first location update has not yet been received, then jump to that location. _firstLocationUpdate = YES; CLLocation *location = [change objectForKey:NSKeyValueChangeNewKey]; _mapView.camera = [GMSCameraPosition cameraWithTarget:location.coordinate zoom:14]; } } @end
在本機執行完整範例應用程式
您可以從 GitHub 取得 Maps SDK for iOS 範例應用程式的下載封存檔。請按照下列步驟安裝及試用 Maps SDK for iOS 範例應用程式。
- 執行
git clone https://github.com/googlemaps-samples/maps-sdk-for-ios-samples.git
將範例存放區複製到本機目錄。 開啟終端機視窗,前往複製範例檔案的目錄,然後深入 GoogleMaps 目錄:
Swift
cd maps-sdk-for-ios-samples-main/GoogleMaps-Swift
pod install
open GoogleMapsSwiftDemos.xcworkspace
Objective-C
cd maps-sdk-for-ios-samples-main/GoogleMaps
pod install
open GoogleMapsDemos.xcworkspace
- 在 Xcode 中按下編譯按鈕,即可使用目前的配置建構應用程式。建構作業會產生錯誤,提示您在
SDKConstants.swift
檔案 (Swift) 或SDKDemoAPIKey.h
檔案 (Objective-C) 中輸入 API 金鑰。 - 如果您還沒有 API 金鑰,請按照操作說明在 Google Cloud 控制台中設定專案並取得 API 金鑰。在 Cloud 控制台中設定金鑰時,您可以限制金鑰,只允許範例應用程式的軟體包 ID 使用金鑰,確保只有您的應用程式可以使用金鑰。SDK 範例應用程式的預設套件 ID 為
com.example.GoogleMapsDemos
。 - 編輯 Swift 或
SDKDemoAPIKey.h
檔案的SDKConstants.swift
檔案,用於 Objective-C,然後將 API 金鑰貼到apiKey
或kAPIKey
常數的定義中。例如:Swift
static let apiKey = "YOUR_API_KEY"
Objective-C
static NSString *const kAPIKey = @"YOUR_API_KEY";
- 在
SDKConstants.swift
檔案 (Swift) 或SDKDemoAPIKey.h
檔案 (Objective-C) 中,移除以下這行程式碼,因為這一行用於登錄使用者定義的問題:Swift
#error (Register for API Key and insert here. Then delete this line.)
Objective-C
#error Register for API Key and insert here.
- 建構並執行專案。iOS 模擬器視窗隨即顯示 Maps SDK 示範清單。
- 選擇其中一個顯示的選項,即可試用 Maps SDK for iOS 的功能。
- 如果系統提示您允許 GoogleMapsDemos 存取您的位置,請選擇「允許」。