在位置访问权限中按下允许按钮后如何执行操作？

Posted 2023-03-05

【中文标题】在位置访问权限中按下允许按钮后如何执行操作？

【英文标题】：how to execute an action after allow button is pressed in the location access permission?

【发布时间】：2018-03-19 06:09:09

【问题描述】：

我正在制作一个使用 GPS 坐标的应用程序，在实施之前，我们必须像上图一样征求用户的许可。

如果用户在该警报中点击“允许”，那么我想要触发 activateGPSToSearchCoordinate()，但如果点击“不允许”，那么我不想做任何事情。

这是我目前的代码，它不能正常工作

class LocationManager: NSObject 
    let manager = CLLocationManager()
    var didGetLocation: ((Coordinate?) -> Void)?

    override init() 
        super.init()

        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.requestLocation()
    

    func getPermission() -> CLAuthorizationStatus 
        // to ask permission to the user by showing an alert (the alert message is available on info.plist)

        if CLLocationManager.authorizationStatus() == .notDetermined 
            manager.requestWhenInUseAuthorization()
            return .notDetermined
         else if CLLocationManager.authorizationStatus() == .denied 
            return .denied
         else if CLLocationManager.authorizationStatus() == .authorizedWhenInUse  
            return .authorizedWhenInUse
         else 
            return .notDetermined
        

    

我将在下面的视图控制器方法中使用该类，尤其是getPermission()

func getCoordinate() 


        let coordinateAuthorizationStatus = locationManager.getPermission()

        if coordinateAuthorizationStatus == .authorizedWhenInUse 
            activateGPSToSearchCoordinate()
         else if coordinateAuthorizationStatus == .denied 
            showAlertSetting()
        

    

目前，如果该权限是第一次触发... 用户点击“允许”或“不允许”，CLAuthorizationStatus 将始终为 .notDetermined

所以 activateGPSToSearchCoordinate() 永远不会被触发。

所以我需要在按下该警报的“允许”后激活activateGPSToSearchCoordinate()

如何解决这个问题？

【参考方案1】：

阅读更多关于CLLocationManagerDelegate的信息，有成功和失败的委托方法。

public func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) 
    GlobalObjects.shared.latitude  = locations[0].coordinate.latitude
    GlobalObjects.shared.longtitude = locations[0].coordinate.longitude
    GlobalObjects.shared.locationOBJ = locations[0]
    print(GlobalObjects.shared.latitude, GlobalObjects.shared.longtitude)


public func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) 

【参考方案2】：

CLLocationManagerDelegate 呢？你试过了吗？

func locationManager(CLLocationManager, didUpdateLocations: [CLLocation])
//Tells the delegate that new location data is available.


func locationManager(CLLocationManager, didFailWithError: Error)
//Tells the delegate that the location manager was unable to retrieve a location value.


func locationManager(CLLocationManager, didFinishDeferredUpdatesWithError: Error?)
//Tells the delegate that updates will no longer be deferred.


func locationManager(CLLocationManager, didUpdateTo: CLLocation, from: CLLocation)
//Tells the delegate that a new location value is available.

在您调用func getCoordinate() 的类/视图控制器上实现CLLocationManagerDelegate。

class TestViewController: CLLocationManagerDelegate 

    override func viewDidLoad() 
       super.viewDidLoad()
       locationManager.delegate = self
    




public func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) 
    // get location coordinate


public func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) 
   // handle error, if any kind of error occurs

这里有很好的示例教程，可以帮助您实现CLLocationManagerDelegate：

https://developer.apple.com/documentation/corelocation/cllocationmanager https://www.raywenderlich.com/160517/mapkit-tutorial-getting-started https://www.appcoda.com/tag/mapkit/ http://www.techotopia.com/index.php/A_Swift_Example_ios_8_Location_Application