如何檢查是否用戶點擊不上NSLocationAlwaysAndWhenInUseUsageDescription雨燕3.2

Question

當用戶在MainViewController

override func viewDidLoad() { 
     super.viewDidLoad() 
     locationManager.delegate = self 
     locationManager.requestAlwaysAuthorization() 
     locationManager.requestWhenInUseAuthorization() 
} 

viewDidLoad()將運行並警告會出現

<key>NSLocationAlwaysAndWhenInUseUsageDescription</key> 
     <string>Accessing user location to determine the nearest pickup location</string> 
     <key>NSLocationWhenInUseUsageDescription</key> 
     <string>Accessing user location to determine the nearest pickup location</string> 

的主要問題是，如果用戶點擊不允許，我該如何檢查編程？例如

// Example code snippet, not from apple officials 
if NSlocation is nil then I want to do some alert 

Answer 1

如果用戶選擇拒絕定位服務您的應用程序訪問，CLLocationManager.authorizationStatus()將.denied（雖然你也應該注意.restricted。如果你想通知當用戶選擇是否沒有允許或拒絕您的應用程序，你可以讓自己的位置經理delegate和實施正確的方法：

class MainViewController: CLLocationManagerDelegate{ 

    let locationManager = CLLocationManager() 

    override func viewDidLoad() -> Void{ 
     super.viewDidLoad() 
     locationManager.delegate = self 
    } 

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) -> Void{ 
     switch status{ 
      case .authorizedAlways, .authorizedWhenInUse: 
       // You're allowed to use location services 
      case .denied, .restricted: 
       // You can't use location services 
      default: 
       // This case shouldn't be hit, but is necessary to prevent a compiler error 
     } 
    } 
} 

Answer 2

低於CLLocationManager委託方法用於檢查用戶點擊不要讓許可警報按鈕。

func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) { 
     switch status { 
     case .denied: 
      print("Show you own alert here") 
      break 
     } 
    } 

要位置設置重定向用戶下面如下：

1. 添加URL類型 「首選項」 像下面的圖片

2. 編寫代碼上的按鈕動作：

   UIApplication.sharedApplication().openURL(NSURL(string:"prefs:root=LOCATION_SERVICES")!)