ios - 快速获取用户位置

Question

这是我的代码:

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

    }


  }
}

此代码不返回任何内容(它应该打印经度)。这似乎没问题，因为如果我移动

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

在 if 语句之外，Xcode 抛出一个运行时错误，并表示它在解包 Optional 值时意外发现 nil。我不明白为什么？系统要求我允许使用我的位置。

谢谢!

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"
}