显示位置权限对话框并立即消失

Question

iOS对话框提示，半秒后消失：

        let locationManager = CLLocationManager()
        switch CLLocationManager.authorizationStatus() {
        case .authorizedWhenInUse:
            print("In Use \(locationManager.location?.description)")
        case .denied, .restricted:
            print("denied")
        case .notDetermined:
            locationManager.requestWhenInUseAuthorization()
        case .authorizedAlways:
            print("always \(locationManager.location)")
        }

我不知道这是否相关，但我正在使用 SWReavealViewController。 Xcode9，编译为 iOS 8.0，模拟器和真实设备

Answer 1

您的 locationManager 变量不会超出其定义范围（该代码片段所在的函数），因此在用户响应对话框之前将其释放。

如果您将 let locationManager = CLLocationManager() 移动到 class 变量，它应该会保留下来。

Answer 2

将 let locationManager = CLLocationManager() 插入 ViewController class 的开头。（在 viewDidLoad() 函数之外）。希望对你有帮助。

class ViewController: UIViewController {

  let locationManager = CLLocationManager()

  override func viewDidLoad() {
    super.viewDidLoad()
  }
}

显示位置权限对话框并立即消失

Location permission dialog is shown and immediately disappears

cllocationmanager

ios

swift