在 Swift 中使用 CoreLocation 实时测量距离

Question

我正在制作一个实时测量速度和距离的应用程序。所以我在测量距离时遇到了问题。我试图通过 return 在函数之外获取位置变量来弄清楚一些事情。但如果我这样做，速度测量就不起作用。那么如何在点击“开始”按钮时开始测量距离，然后在点击“停止”按钮时停止？

@IBAction func startStopButtonDidTouch(_ sender: UIButton) {
    if isStarted { //When tapped STOP
        timer?.invalidate()
        isStarted = false
        locationManager.stopUpdatingLocation()
        startStopButton.setTitle("START", for: .normal)
   
    } else { //When tapped START
        locationManager.startUpdatingLocation()
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTimeLabel), userInfo: nil, repeats: true)
        isStarted = true
        startStopButton.setTitle("STOP", for: .normal)
    }
}

func locationManager (_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let location = locations[0]
    speedLabel.text = "\(Int(location.speed * 3.6))" 
}

Answer 1

启动位置更新，您将在 didUpdateLocations 方法中获得更新。

此方法可以很好地启动和停止位置更新。

var startLocation:CLLocation!
@IBAction func startStopButtonDidTouch(_ sender: UIButton) {
    if isStarted { //When tapped STOP
        timer?.invalidate()
        isStarted = false
        locationManager.stopUpdatingLocation()
        startStopButton.setTitle("START", for: .normal)
   
  } else { //When tapped START
    locationManager.startUpdatingLocation()
    isStarted = true
    startStopButton.setTitle("STOP", for: .normal)
   }
}

在这里你必须实时更新距离和速度的标签。

func locationManager (_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) 
{
            let location = locations[0]
            speedLabel.text = "\(Int(location.speed * 3.6))"
   if (startLocation == nil)
   {
      startLocation = location;
   }
   let endLocation = location;
            //Distance measure code will be placed here.
   //In KM
   let distance = startLocation.distance(from: endLocation) / 1000
}

在 Swift 中使用 CoreLocation 实时测量距离

Measure distance in real time with CoreLocation in Swift

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swift