Swift，NSObject 中的 CLLocationManagerDelegate 不起作用

Question

我在使用 CLLocationDelegate 获取我的位置时遇到问题。我创建了 UIView 的新子类并且运行良好，但是当我创建 NSObject 的子类时，未调用 CLLocationDelegate。我可以找到问题所在。这是我的代码:

import UIKit
import CoreLocation

class LocationData: NSObject, CLLocationManagerDelegate {

var locationManager : CLLocationManager = CLLocationManager()

override init() {
    super.init()
    if self.locationManager.respondsToSelector(Selector("requestAlwaysAuthorization")) {
        self.locationManager.requestWhenInUseAuthorization()
    }
    self.locationManager.delegate = self
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.locationManager.distanceFilter = 50
    self.locationManager.startUpdatingLocation()
    println("init LocationData")
}

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
    println(error.description)
    }

    func locationManager(manager: CLLocationManager!, didUpdateToLocation newLocation: CLLocation!, fromLocation oldLocation: CLLocation!) {
    println("updated")
    }
}

谢谢!

Answer 1

您的代码没问题!但是在实例化类时，你需要这样做:

 import UIKit

 class ViewController: UIViewController {

 let LocationData: LocationData = LocationData()  //<- here is the secret to works!!!

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

我还建议您将 init 更改为如下内容:

override init() {
    super.init()

    let authorizationStatus: CLAuthorizationStatus = CLLocationManager.authorizationStatus()

    if authorizationStatus == .notDetermined {
        locationManager.requestWhenInUseAuthorization()
    }

    self.locationManager.delegate = self
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.locationManager.distanceFilter = 50
    self.locationManager.startUpdatingLocation()
    print("init LocationData")
}

并且不要忘记在 info.plist 项目中添加 NSLocationWhenInUseUsageDescription。