Swift 3中没有计算距离

时间:2016-10-25 17:48:34

标签: ios swift location cllocationmanager distance

我正在尝试使用CLLocationManager计算行进距离并显示标签内部的距离。请求使用位置工作但标签中没有显示任何内容。我已经尝试过模拟xCode模拟器内部的驱动器,但无济于事。我有一个显示在应用程序内部的地图,并且有效,它可以跟踪我的位置,但这些都有效。

继承我的locationManager方法:

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

    // Map

    theLabel.text = "\(locations[0])"
    myLocations.append(locations[0] as! CLLocation)

    let spanX = 0.007
    let spanY = 0.007
    let newRegion = MKCoordinateRegion(center: theMap.userLocation.coordinate, span: MKCoordinateSpanMake(spanX, spanY))
    theMap.setRegion(newRegion, animated: true)

    if (myLocations.count > 1){
        let sourceIndex = myLocations.count - 1
        let destinationIndex = myLocations.count - 2

        let c1 = myLocations[sourceIndex].coordinate
        let c2 = myLocations[destinationIndex].coordinate
        var a = [c1, c2]
        let polyline = MKPolyline(coordinates: &a, count: a.count)
        theMap.add(polyline)
    }

    // Labels

    let latestLocation: AnyObject = locations[locations.count - 1]
    lat.text = String(format: "%.4f", latestLocation.coordinate.latitude)
    long.text = String(format: "%.4f", latestLocation.coordinate.longitude)
    horizAcc.text = String(format: "%.4f", latestLocation.horizontalAccuracy)
    altitude.text = String(format: "%.4f", latestLocation.altitude)
    vertAcc.text = String(format: "%.4f", latestLocation.verticalAccuracy)

    if startLocation == nil {
        startLocation = latestLocation as! CLLocation
    }

    let distanceBetween = (latestLocation.distance(from: startLocation))

    distance.text = String(format: "%.2f", distanceBetween)

}

非常感谢任何帮助!如果需要,我可以提供更多代码。

1 个答案:

答案 0 :(得分:0)

听起来您没有为CLLocationManager的实例正确设置委托属性。您需要让它知道哪个对象包含CLLocationManagerDelegate方法的实现,就像您列出的方法一样。

因此,假设您的视图控制器符合CLLocationManagerDelegate并包含您发布的方法,并假设您已经为视图控制器CLLocationManager提供了名为“locationManager”的属性,则只需将其设置为:< / p>

    self.locationManager.delegate = self
    self.locationManager.startUpdatingLocation()

您可以将它放在viewDidLoad:或适合您需要的任何地方,并且应该调用您的didUpdateLocation委托方法。