ios - 在我调用 requestWhenInUseAuthorization() 之前触发位置权限对话框

Question

当我的观点出现时:

struct TurnOnLocation: View {
    
    var body: some View {
        ZStack {
            Color.orange
                .edgesIgnoringSafeArea(.all)
            VStack {
                Spacer()
                Image(systemName: "globe")
                    .resizable()
                    .aspectRatio(contentMode: .fill)
                    .foregroundColor(.white)
                Spacer()

                Button(action: {
                    let locationManager = LocationManager()
                    locationManager.locationManager.requestWhenInUseAuthorization()
                    locationManager.locationManager.startUpdatingLocation()
                }) {
                    Text("Turn on location")
                }.foregroundColor(Color.black)
                .font(Font.system(size:22))
                .padding(20)
                .background(
                    Rectangle()
                        .fill(Color.white)
                        .border(Color.white, width:1)
                )
                .cornerRadius(50)
                .shadow(radius: 10)
                .padding(50)
            }
        }
    }
}

它在 Button 之前询问用户位置。被轻拍。为什么是这样？我在下面添加了我的模型，以便在初始化时触发(应该是在单击按钮时)。

class LocationManager: NSObject, ObservableObject {
    @Published var locationStatus: CLAuthorizationStatus? = CLAuthorizationStatus.notDetermined
    @Published var locationPermissionStatus = PermissionStatus.unknown
    @Published var location: CLLocation?
    let locationManager = CLLocationManager()
    
    override init(){
        super.init()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()
        self.locationManager.startUpdatingLocation()
    }
    
    enum PermissionStatus {
        case unknown
        case authorizedWhenInUse
        case authorizedAlways
        case restricted
        case denied
    }
    
    func getLocation() -> CLLocationCoordinate2D? {
        return self.location?.coordinate
    }
    
}

知道如何确保对话框仅在单击按钮后显示吗？
编辑:
我已经更新了代码:

Button(action: {
    let locationManager = LocationManager()
    locationManager.requestPermission()
})

型号

class LocationManager: NSObject, ObservableObject , CLLocationManagerDelegate {
    @Published var locationStatus: CLAuthorizationStatus? = CLAuthorizationStatus.notDetermined
    @Published var locationPermissionStatus = PermissionStatus.unknown
    @Published var location: CLLocation?
    let locationManager = CLLocationManager()
    
    override init(){
        super.init()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    }
    
    func requestPermission(){
        self.locationManager.requestWhenInUseAuthorization()
    }
    
    func locationManager(_ manager: CLLocationManager,
                         didChangeAuthorization status: CLAuthorizationStatus) {   switch status {
          case .restricted, .denied:
             // Disable your app's location features
            print("restricted")
             break
                
          case .authorizedWhenInUse:
             // Enable your app's location features.
            print("authorizedWhenInUse")
            self.locationManager.startUpdatingLocation()
             break
                
          case .authorizedAlways:
             // Enable or prepare your app's location features that can run any time.
            print("authorizedAlways")
            self.locationManager.startUpdatingLocation()
             break
                
          case .notDetermined:
            print("notDetermined")
             break
       }
    }

但是，当我单击该按钮时，询问位置权限的对话框会在一秒钟后消失。知道为什么吗？

Answer 1

有两点需要修复:

您已经调用了requestWhenInUseAuthorization在 init ，这就是您在构建按钮时看到警报的原因。您应该删除 requestWhenInUseAuthorization在 init .

您应该调用 startUpdatingLocation在你确定你有授权后，在 LocationManager .

func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
    switch status {
    case .authorizedAlways, .authorizedWhenInUse:
        manager.startUpdatingLocation()
    default:
        print("no auth")
    }
}