位置不断更新的问题iOSSwift

Question

我正在获取用户的当前位置并将其作为 println() 删除。这个想法是我要点击一个按钮来获取新位置，但是目前该应用程序一直在不断更新（每秒）。我曾尝试在我的 IBAction 中移动 getLocation() 函数，但这使它崩溃了。我已经更新了 info.plist 所以这不是问题。这是代码：

    import UIKit
import CoreLocation


class ViewController: UIViewController, CLLocationManagerDelegate{

    @IBOutlet var latitude : UILabel!
    @IBOutlet var longitude : UILabel!

    var locationManager = CLLocationManager()
    var startLocation: CLLocation!


    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager = CLLocationManager()
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func findMyLocation(sender: AnyObject){
        startLocation = nil
        locationManager.startUpdatingLocation()

    }

    func getLocation(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!){

        var userLocation:AnyObject = locations[0] as! CLLocation

        var strlat = String(format: "%.4f", userLocation.coordinate.latitude)
        var strlong = String(format: "%.4f",userLocation.coordinate.longitude)

        latitude.text = String(format: "%.4f", userLocation.coordinate.latitude)
        longitude.text = String(format: "%.4f",userLocation.coordinate.longitude)

        println("latitude: " + strlat)
        println("longitide: " + strlong)

        if startLocation == nil {
            startLocation = userLocation as! CLLocation
            locationManager.stopUpdatingLocation()
        }



    }

    func locationManager(manager: CLLocationManager!,
        didFailWithError error: NSError!) {

    }
}

Answer 1

将 locationManager.startUpdatingLocation() 移至您的 findMyLocation 函数。这将在您按下按钮时启动 locationManager 并开始调用 didUpdateLocations 在您的 if startLocation == nil 中添加 locationManager.stopUpdatingLocation() 这将在您设置 startLocation var 后停止 locationManager。每次用户按下按钮时，该过程将再次运行。

另外请注意，您应该在 didUpdateLocations 中添加更多代码以在使用之前检查位置的准确性和时间戳，因为它可能不是您所处的 valid/accurate 位置正在努力。

更新：

有机会验证，代码将按照建议的更改工作。您的最终代码应该如下所示。我还假设您已经为位置服务设置了 plist 条目，并且您的模拟器设置为模拟位置。

import UIKit
import CoreLocation


class ViewController: UIViewController, CLLocationManagerDelegate{

    @IBOutlet var latitude : UILabel!
    @IBOutlet var longitude : UILabel!

    var locationManager : CLLocationManager! = CLLocationManager()
    var startLocation: CLLocation!


    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func findMyLocation(sender: AnyObject){
        startLocation = nil
        locationManager.startUpdatingLocation()

    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!){

        var userLocation:AnyObject = locations[0] as! CLLocation

        var strlat = String(format: "%.4f", userLocation.coordinate.latitude)
        var strlong = String(format: "%.4f",userLocation.coordinate.longitude)

        latitude.text = String(format: "%.4f", userLocation.coordinate.latitude)
        longitude.text = String(format: "%.4f",userLocation.coordinate.longitude)

        println("latitude: " + strlat)
        println("longitide: " + strlong)

        if startLocation == nil {
            startLocation = userLocation as! CLLocation
            locationManager.stopUpdatingLocation()
        }



    }

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {

        println("error with location manager: " + error.description)

    }


}

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