Swift requestWhenInUseAuthorization 不起作用

Question

我正在使用 swift 为 iOS 9.3 编写一个应用程序，需要一张 map 来显示用户位置。我初始化 CLLocationManager 及其委托(delegate)，我配置 info.plistPrivacy - Location Usage Description 字符串并调用 requestWhenInUseAuthorization 但它不显示任何授权请求。

这是我的代码:

import UIKit
import MapKit

class DetailController: UIViewController, CLLocationManagerDelegate {

    var locManager: CLLocationManager!

    @IBOutlet var myMap: MKMapView!

    override func viewDidLoad() {
        super.viewDidLoad()

        mostraPosizione()
    }

    func mostraPosizione(){
        locManager = CLLocationManager()
        locManager.delegate = self
        locManager.desiredAccuracy = kCLLocationAccuracyBest

        let authorizationStatus = CLLocationManager.authorizationStatus()

        if (authorizationStatus == CLAuthorizationStatus.NotDetermined) {
            locManager.requestWhenInUseAuthorization()
        } else {
            locManager.startUpdatingLocation()
        }


        myMap.showsUserLocation = true
    }

    func locManager(manager: CLLocationManager, 
    didChangeAuthorizationStatus status: CLAuthorizationStatus) {

        if (status == CLAuthorizationStatus.NotDetermined) {
            locManager.requestWhenInUseAuthorization()

        } else {
            locManager.startUpdatingLocation()
        }
    }
}

还有一张来 self 的 info.plist 的截图

Xcode 输出:

Trying to start MapKit location updates without prompting for location authorization. Must call -[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager requestAlwaysAuthorization] first.

我正在 iPhone 5s (iOS 9.3) 模拟器上测试它。

这东西有什么问题？有人有什么建议吗？

Answer 1

我觉得是因为

let authorizationStatus = CLLocationManager.authorizationStatus()

是 nil，所以您的 requestWhenInUseAuthorization() 永远不会被调用。

  let authorizationStatus = CLLocationManager.authorizationStatus()

    if (authorizationStatus == CLAuthorizationStatus.NotDetermined) || (authorizationStatus == nil) {
        locManager.requestWhenInUseAuthorization()
    } else {
        locManager.startUpdatingLocation()
    }

应该可以工作。

编辑:

如果用户拒绝请求，你也应该处理这个案例

if (authorizationStatus == CLAuthorizationStatus.Denied ) {
  // Display a message, do what you want 
}

确实，一旦用户拒绝授权，您就无法再次出现弹出窗口，用户必须进入应用程序设置并自行设置使用其位置的授权。但是，您现在可以直接从您的应用程序到设置的链接，因此对用户来说更容易。

// Open the settings of your app
if let url = NSURL(string:UIApplicationOpenSettingsURLString) {
    UIApplication.sharedApplication().openURL(url)
}