class AppDelegate: UIResponder, UIApplicationDelegate, UISplitViewControllerDelegate {
var window: UIWindow?
let store = Store.default
var map: GMSMapView?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    guard GMSServices.provideAPIKey(AppConstants.Keys.googleMaps.rawValue) else { fatalError("Can not initialize Google Map services") }
    self.map = GMSMapView()
    print("Map: \(self.map)")

    return true
}

试着像这样改变它

检查控制台输出。您应该看到以下错误：第一个月
您尝试在GMSService.provideAPIKey之前初始化mapView

遵循以下步骤：

• • 步骤1：**按如下所示将API密钥添加到AppDelegate.swift：

1.添加以下import语句：

import GoogleMaps

1.使用API密钥将以下代码添加到application(_:didFinishLaunchingWithOptions:)方法中：

GMSServices.provideAPIKey("YOUR_API_KEY")

• • 步骤2：**添加Map：

1.在应用的默认ViewController中添加方法，以创建和初始化GMSMapView的示例。

import UIKit
import GoogleMaps

class ViewController: UIViewController {
    var mapView: GMSMapView!
    override func viewDidLoad() {
        super.viewDidLoad()
        let camera = GMSCameraPosition.camera(withLatitude: -33.86, longitude: 151.20, zoom: 6.0)
        mapView = GMSMapView.map(withFrame: self.view.frame, camera: camera)
        self.view.addSubview(mapView)
  }
}

1.运行应用程序。

替代解决方案：

更改appDelegate.swift中的现有代码：

class AppDelegate: UIResponder, UIApplicationDelegate, UISplitViewControllerDelegate {
var window: UIWindow?
let store = Store.default
let map: GMSMapView!

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    GMSServices.provideAPIKey(AppConstants.Keys.googleMaps.rawValue)
    let frame = CGRect(x: 0, y: 0, width: width, height: height)
    map = GMSMapView.map(withFrame: self.view.frame)
    // map object is ready to use
    print(map)
    return true
}

未知width和height是设备屏幕尺寸。