启用“我的位置”按钮

“启用‘我的位置’按钮”图片。

我的位置按钮会显示在地图视图的右下角。当用户点按该按钮时，地图会平移到用户的当前位置。

开始使用

您必须先配置开发环境，然后才能试用该示例代码。如需了解详情，请参阅 Maps SDK for iOS 代码示例。

查看代码

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)
  }
}
MyLocationViewController.swift

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
MyLocationViewController.m

在本地运行完整示例应用

Maps SDK for iOS 示例应用以GitHub 上的下载归档文件的形式提供。请按照以下步骤安装并试用 Maps SDK for iOS 示例应用。

  1. 运行 git clone https://github.com/googlemaps-samples/maps-sdk-for-ios-samples.git 以将示例代码库克隆到本地目录。

  2. 打开一个终端窗口，导航到您克隆示例文件的目录，然后展开 GoogleMaps 目录：

    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“编译”按钮，使用当前方案构建应用。构建会产生错误，提示您在 Swift 的 SDKConstants.swift 文件或 Objective-C 的 SDKDemoAPIKey.h 文件中输入 API 密钥。
  4. 从已启用 Maps SDK for iOS 的项目中获取 API 密钥。
  5. 针对 Swift 修改 SDKConstants.swift 文件，针对 Objective-C 修改 SDKDemoAPIKey.h 文件，然后将您的 API 密钥粘贴到 apiKey 或 kAPIKey 常量的定义中。例如：

    Swift

    static let apiKey = "YOUR_API_KEY"

    Objective-C

    static NSString *const kAPIKey = @"YOUR_API_KEY";
  6. 在 SDKConstants.swift 文件 (Swift) 或 SDKDemoAPIKey.h 文件 (Objective-C) 中，移除以下行，因为它用于注册用户定义的问题：

    Swift

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

    Objective-C

    #error Register for API Key and insert here.
  7. 构建并运行项目。系统随即会显示 iOS 模拟器窗口，其中列出了 Maps SDK 演示版。
  8. 选择显示的选项之一，以便试用 Maps SDK for iOS 的某项功能。
  9. 如果系统提示您允许 GoogleMapsDemos 访问您的位置信息，请选择允许。