Question

我正在尝试创建一个LocationManager类来处理所有GPS数据。我需要多个视图控制器中的GPS数据。问题是函数被调用但我没有得到坐标。我在状态栏中看到了GPS图标，但几秒后就消失了。

GPSTrackerManager.swift

    class GPSTrackingManager: NSObject, CLLocationManagerDelegate {

    var locationManager: CLLocationManager!
    var seenError : Bool = false

    func startTracking() {

        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestAlwaysAuthorization()
        locationManager.startUpdatingLocation() 
    }

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        locationManager.stopUpdatingLocation()
        if ((error) != nil) {
            if (seenError == false) {
                seenError = true
                print(error)
            }
        }
    }

    func locationManager(manager:CLLocationManager, didUpdateLocations locations:[AnyObject]) {
        //println("locations = \(locationManager)")
        var latValue = locationManager.location.coordinate.latitude
        var lonValue = locationManager.location.coordinate.longitude

        println(latValue)
        println(lonValue)

    }
}

我如何在我的VC中的ViewDidLoad中调用它：

var tracking = GPSTrackingManager()
tracking.startTracking()

Answer 1

您声明它将在viewDidLoad方法完成后立即消失的方式，因为它的范围是方法的本地范围。您需要将tracking设置为视图控制器的属性，以便它可以保留：

class ViewController: UIViewController {
    var tracking = GPSTrackingManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        // ...
        tracking.startTracking()
    }
}

Swift：LocationManager在不同的类中

1 个答案: