requestWhenInUseAuthorization（）在iOS 8中不起作用Info.plist中的NSLocationWhenInUseUsageDescription键 [英] requestWhenInUseAuthorization() not Work in iOS 8 With NSLocationWhenInUseUsageDescription Key in Info.plist

问题描述

我正在使用iOS SDK 8.1尝试调用requestWhenInUseAuthorization（）方法来提示用户授予对我的应用的访问权限。我导入了CoreLocation.framework，并将NSLocationWhenInUseUsageDescription和NSLocationAlwaysUsageDescription键添加到info.plist中。当我运行应用程序时，它从未提示我进行位置访问。以下是我的代码，我错过了什么？

I am using iOS SDK 8.1 trying to call requestWhenInUseAuthorization() method to prompt user to grant access to my app. I imported CoreLocation.framework, and added NSLocationWhenInUseUsageDescription and NSLocationAlwaysUsageDescription keys into info.plist. When I ran the app, it never prompted me for location access. Below is my code, what have I missed?

import UIKit
import CoreLocation
import MapKit

class ViewController: UIViewController, CLLocationManagerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        var manager = CLLocationManager()
        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest

        let authorizationStatus = CLLocationManager.authorizationStatus()
        switch authorizationStatus {
        case .Authorized:
            println("authorized")
        case .AuthorizedWhenInUse:
            println("authorized when in use")
        case .Denied:
            println("denied")
        case .NotDetermined:
            println("not determined")
        case .Restricted:
            println("restricted")
        }

        manager.requestWhenInUseAuthorization()
        manager.startUpdatingLocation()

    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        let location = locations[0] as CLLocation
        println("Latitude: \(location.coordinate.latitude). Longitude: \(location.coordinate.longitude).")
    }

    func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        switch status {
        case .Authorized:
            println("authorized")
        case .AuthorizedWhenInUse:
            println("authorized when in use")
        case .Denied:
            println("denied")
        case .NotDetermined:
            println("not determined")
        case .Restricted:
            println("restricted")
        }
    }

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

}

控制台只显示未确定一次，没有别的。所以我去了iPhone模拟器=>设置=>隐私=>位置=>我的应用程序它向我展示了3个选项：从不，使用应用程序时，始终。但没有任何东西可以选择ected。

The console only showed "not determined" once and nothing else. So I went to iPhone Simulator => Settings => Privacy => Location => My App. It showed me 3 options: "Never", "While Using the App", "Always". But nothing was selected.

推荐答案

问题解决了。我的管理器在 viewDidLoad（）方法中声明为本地var，但它应该是类级属性。

Problem solved. My manager was declared as local var inside viewDidLoad() method, but it should've been a class level property.

我将经理声明移出 viewDidLoad（），我的应用程序工作。

After I moved manager declaration out of viewDidLoad(), my app worked.

不确定 manager.requestWhenInUseAuthorization（）究竟是如何在幕后工作的在 viewDidLoad（）中定义的 manager 不起作用。希望知道这个细节的人启发我。

Not sure how exactly manager.requestWhenInUseAuthorization() work behind the scene and why exactly manager defined within viewDidLoad() not work. Hope someone who knows this detail enlighten me.

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