Swift LocationManager didChangeAuthorizationStatus始终被调用 [英] Swift LocationManager didChangeAuthorizationStatus Always Called

问题描述

我有一个视图控制器，它实现 CLLocationManagerDelegate 。我创建了一个CLLocationManager变量：

  let locationManager = CLLocationManager（）
  

然后在 viewDidLoad 中，我设置了属性：

  //设置位置管理器属性
 locationManager.delegate = self 
 locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters 
 locationManager.distanceFilter = 50 
  

问题是，即使在我检查授权状态之前，函数也会被调用。

  func locationManager（经理：CLLocationManager！，didChangeAuthorizationStatus状态：CLAuthorizationStatus）{
 if（status == .AuthorizedWhenInUse）{
 //用户已授予自动化到位置，获取位置
 locationManager.startUpdatingLocation（）
} 
} 
  

任何人都可以告诉我可能导致这种情况发生的原因吗？

解决案例

- 初始化 CLLocationManager 后不久调用locationManager：didChangeAuthorizationStatus：。 p>

如果需要，您可以在委托方法中请求授权：

  func locationManager（manager：CLLocationManager！，didChangeAuthorizationStatus status：CLAuthorizationStatus）{
 switch status {
 case .NotDetermined：
 locationManager.requestAlwaysAuthorization（）
 break 
 case .AuthorizedWhenInUse： 
 locationManager.startUpdatingLocation（）
 break 
 case .AuthorizedAlways：
 locationManager.startUpdatingLocation（）
 break 
 case .Restricted：
 //受到例如限制家长控制权。用户无法启用位置服务
中断
的情况.Denied：
 //用户拒绝您的应用访问位置服务，但可以从Settings.app 
 break $ b授予访问权限$ b默认值：
中断
} 
} 
  

请注意如果你想让它工作，你需要在及时的情况下分配代表。

如果你以某种方式延迟委托分配，例如通过异步设置，您可能会错过对的初始调用 - locationManager：didChangeAuthorizationStatus：。

I have a view controller which implements the CLLocationManagerDelegate. I create a the CLLocationManager variable:

let locationManager = CLLocationManager()

Then in the viewDidLoad, I set properties:

// Set location manager properties
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
locationManager.distanceFilter = 50

The problem comes that the function gets called even before I check the authorization status.

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    if (status == .AuthorizedWhenInUse) {
        // User has granted autorization to location, get location
        locationManager.startUpdatingLocation()
    }
}

Can anyone inform me what could be causing this to occur?

解决方案

- locationManager:didChangeAuthorizationStatus: is called shortly after the CLLocationManager is initialised.

You can request authorization inside the delegate method if you want:

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    switch status {
    case .NotDetermined:
        locationManager.requestAlwaysAuthorization()
        break
    case .AuthorizedWhenInUse:
        locationManager.startUpdatingLocation()
        break
    case .AuthorizedAlways:
        locationManager.startUpdatingLocation()
        break
    case .Restricted:
        // restricted by e.g. parental controls. User can't enable Location Services
        break
    case .Denied:
        // user denied your app access to Location Services, but can grant access from Settings.app
        break
    default:
        break
    }
}

Be aware that you need to assign the delegate in a 'timely' matter if you want this to work.

If you would somehow delay the delegate assignment, e.g. by setting it asynchronously, you might miss the initial call to - locationManager:didChangeAuthorizationStatus:.

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