獲得在迅速

Question

用戶位置這是我的代碼：

import Foundation 
import CoreLocation 

class ViewController: UIViewController, CLLocationManagerDelegate { 

let locationManager = CLLocationManager() 

@IBOutlet weak var locationLabel: UILabel! 

var coord: CLLocationCoordinate2D? 

override func viewDidLoad() { 
    super.viewDidLoad() 
    locationManager.delegate = self 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest 
    locationManager.requestWhenInUseAuthorization() 
    if CLLocationManager.authorizationStatus() == CLAuthorizationStatus.Authorized { 
     locationManager.startUpdatingLocation() 
     println(coord!.longitude) 
     locationLabel.text = "location found" 
    } 

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) { 
     var locationArray = locations as NSArray 
     var locationObj = locationArray.lastObject as CLLocation 
     coord = locationObj.coordinate 

    } 


    } 
} 

此代碼不返回任何東西（它應該打印經度）。這似乎O.K因爲如果我移動

  locationManager.startUpdatingLocation() 
     println(coord!.longitude) 

出來的if語句，Xcode中引發運行時錯誤，並說，它意外地發現零而展開的可選值。我不明白爲什麼？系統要求我允許我使用我的位置。

謝謝！

Answer 1

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 
    locationManager = CLLocationManager() 
    locationManager.delegate = self 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest 
    locationManager.requestAlwaysAuthorization() 
    locationManager.startUpdatingLocation() 
} 

func locationManager(manager:CLLocationManager, didUpdateLocations locations:AnyObject[] { 
    println("locations = \(locations)") 
    gpsResult.text = "success" 
} 

Answer 2

你在iOS8上運行？假設這樣：

1.You需要後，初始化 self.locationManager = CLLocationManager()

2.右鍵，調用self.locationManager.requestAlwaysAuthorization();（前self.locationManager.delegate = self）

3.添加這些鍵Info.plist中，使用外部文本編輯器（改變相應的文本）

<key>NSLocationWhenInUseUsageDescription</key> 
<string>This is needed for iOS8 and up (when in use)</string> 

<key>NSLocationAlwaysUsageDescription</key> 
<string>This is needed for iOS8 and up (always)</string> 

4.地方，你叫println(coord!.longitude)可能還爲時過早。將其移入locationManager函數。

然後它應該顯示一個警報詢問使用位置服務的權限。