啟用和停用地圖手勢

只有在切換開關為開啟狀態時，地圖才會回應縮放手勢。

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。

查看程式碼

Swift

import GoogleMaps
import UIKit

class GestureControlViewController: UIViewController {
  private let holderHeight: CGFloat = 60
  private let zoomLabelInset: CGFloat = 16

  private lazy var mapView: GMSMapView = {
    let camera = GMSCameraPosition(latitude: -25.5605, longitude: 133.605097, zoom: 3)
    return GMSMapView(frame: .zero, camera: camera)
  }()
  private lazy var zoomSwitch: UISwitch = UISwitch(frame: .zero)

  override func viewDidLoad() {
    super.viewDidLoad()

    view.addSubview(mapView)

    let holder = UIView(frame: .zero)
    holder.backgroundColor = UIColor(white: 1, alpha: 0.8)
    view.addSubview(holder)

    let zoomLabel = UILabel(frame: .zero)
    zoomLabel.text = "Zoom gestures"
    zoomLabel.font = .boldSystemFont(ofSize: 18)
    holder.addSubview(zoomLabel)

    // Control zooming.
    holder.addSubview(zoomSwitch)
    zoomSwitch.addTarget(self, action: #selector(toggleZoom), for: .valueChanged)
    zoomSwitch.isOn = true

    [mapView, holder, zoomLabel, zoomSwitch].forEach({
      $0.translatesAutoresizingMaskIntoConstraints = false
    })
    NSLayoutConstraint.activate([
      mapView.leftAnchor.constraint(equalTo: view.leftAnchor),
      mapView.rightAnchor.constraint(equalTo: view.rightAnchor),
      mapView.topAnchor.constraint(equalTo: view.topAnchor),
      mapView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
      holder.heightAnchor.constraint(equalToConstant: holderHeight),
      holder.centerXAnchor.constraint(equalTo: view.centerXAnchor),
      holder.widthAnchor.constraint(equalTo: view.widthAnchor),
      zoomLabel.leftAnchor.constraint(equalTo: holder.leftAnchor, constant: zoomLabelInset),
      zoomLabel.centerYAnchor.constraint(equalTo: holder.centerYAnchor),
      zoomSwitch.rightAnchor.constraint(equalTo: holder.rightAnchor, constant: -zoomLabelInset),
      zoomSwitch.centerYAnchor.constraint(
        equalTo: holder.centerYAnchor),
    ])
    NSLayoutConstraint.activate([
      holder.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor)
    ])
  }

  @objc func toggleZoom() {
    mapView.settings.zoomGestures = zoomSwitch.isOn
  }

}
GestureControlViewController.swift
      

Objective-C

#import "GoogleMapsDemos/Samples/GestureControlViewController.h"

#import <GoogleMaps/GoogleMaps.h>

@implementation GestureControlViewController {
  GMSMapView *_mapView;
  UISwitch *_zoomSwitch;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-25.5605
                                                          longitude:133.605097
                                                               zoom:3];

  _mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
  _mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
  _mapView.accessibilityIdentifier = @"gestureControlDemoMapView";

  self.view = [[UIView alloc] initWithFrame:CGRectZero];
  [self.view addSubview:_mapView];

  UIView *holder = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 59)];
  holder.autoresizingMask =
      UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin;
  holder.backgroundColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.8f];
  [self.view addSubview:holder];

  // Zoom label.
  UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(16, 16, 200, 29)];
  label.text = @"Zooming?";
  label.font = [UIFont boldSystemFontOfSize:18.0f];
  label.textAlignment = NSTextAlignmentLeft;
  label.backgroundColor = [UIColor clearColor];
  label.layer.shadowColor = [[UIColor whiteColor] CGColor];
  label.layer.shadowOffset = CGSizeMake(0.0f, 1.0f);
  label.layer.shadowOpacity = 1.0f;
  label.layer.shadowRadius = 0.0f;
  [holder addSubview:label];

  // Control zooming.
  _zoomSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(-90, 16, 0, 0)];
  _zoomSwitch.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
  [_zoomSwitch addTarget:self
                  action:@selector(didChangeZoomSwitch)
        forControlEvents:UIControlEventValueChanged];
  _zoomSwitch.on = YES;
  [holder addSubview:_zoomSwitch];
}

- (void)didChangeZoomSwitch {
  _mapView.settings.zoomGestures = _zoomSwitch.isOn;
}

@end
GestureControlViewController.m
      

在本機執行完整的範例應用程式

您可以從 GitHub 下載封存檔，取得 Maps SDK for iOS 範例應用程式。請按照下列步驟安裝及試用 Maps SDK for iOS 範例應用程式。

1. 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。

2. 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

3. 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。
4. 如果您尚未取得 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，僅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。
5. 編輯 Swift 的 SDKConstants.swift 檔案或 Objective-C 的 SDKDemoAPIKey.h 檔案，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";

6. 在 SDKConstants.swift 檔案 (Swift) 或 SDKDemoAPIKey.h 檔案 (Objective-C) 中，移除下列行，因為這會用來註冊使用者定義的問題：

   Swift

   #error (Register for API Key and insert here. Then delete this line.)

   Objective-C

   #error Register for API Key and insert here.

7. 建構並執行專案。iOS 模擬器視窗隨即顯示 Maps SDK 示範清單。
8. 選擇其中一個顯示的選項，即可試用 Maps SDK for iOS 的功能。
9. 如果系統提示您允許 GoogleMapsDemos 存取您的位置，請選擇「允許」。