Question

我有一个像Uber应用程序一样可以计算行驶距离的应用程序。当驾驶员开始旅行时，即使在搜索乘车中已指定起点，位置也会开始改变，驾驶员可能会决定通过替代路线或经过长途路线，因为他/她不知道最短的路线，然后如何计算总距离。

开始位置是驾驶员按下开始按钮的位置终点位置是驾驶员按下停止按钮的位置

到目前为止，这是我的代码

    public func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        lastLocation = locations.last!
        endTrip(locations.last)

        if !hasSetInitialLocation {

            let camera = GMSCameraPosition.camera(withTarget: lastLocation!.coordinate, zoom: 17)
            self.mapView.animate(to: camera)
            hasSetInitialLocation = true
            endTrip(lastLocation)
            MqttManager.instance.connectToServer()
        }
    }



func endTrip(endLoaction: CLLocation) {
        guard let statusChange = source.getStatusChange() else{return}
        var distanceTraveled: Double = 0.0
        let initialLocation = CLLocation(latitude: (statusChange.meta?.location?.lat)!, longitude: (statusChange.meta?.location?.lng)!)
        let distance = initialLocation.distance(from: endLoaction)
        distanceTraveled += distance
        let distanceInKM = Utility.convertCLLocationDistanceToKiloMeters(targetDistance: distanceTraveled)
}

由于建议的起点和终点可能会发生路线变化，因此我该如何计算距离以反映驾驶员移动的总距离。

驾驶员按下了一个称为“开始行程”的按钮，我想获取从那一刻到他按下按钮的最终行程之间的距离

可以从类似的工作代码中获得此实现，但唯一的区别是它们是一个开始按钮，该按钮传递该点的坐标，而停止坐标是该坐标的终点。

enum DistanceValue: Int {
                case meters, miles
            }

            func calculateDistanceBetweenLocations(_ firstLocation: CLLocation, secondLocation: CLLocation, valueType: DistanceValue) -> Double {
                var distance = 0.0
                let meters = firstLocation.distance(from: secondLocation)
                distance += meters
                switch valueType {
                case .meters:
                    return distance
                case .miles:
                    let miles = distance
                    return miles
                }
            }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
            if startLocation == nil {
                startLocation = locations.first
            } else if let location = locations.last {
                runDistance += lastLocation.distance(from: location)
                let calc = calculateDistanceBetweenLocations(lastLocation, secondLocation: location, valueType: .meters)

                print("TOTAL LOC 1 \(calc)")
                print("TOTAL LOC 2 \(runDistance)")
            }
            lastLocation = locations.last

        }

如我的打印报表print("TOTAL LOC 1 \(calc)") print("TOTAL LOC 2 \(runDistance)")所示，我怎么做

calc与runDistance

这是控制台中打印的内容

TOTAL LOC 10.29331530774379
TOTAL LOC 2 10.29331530774379
TOTAL LOC 2.2655118031831587
TOTAL LOC 2 12.558827110926948

Answer 1

如果使用第一个和最后一个坐标来获得这样的距离，则它始终会返回错误的值，因为它无法识别实际的行驶路径。

我确实使用以下代码解决了相同的问题。

使用GoogleMaps

> pod 'GoogleMaps'

在驾驶员在路线上移动时制作坐标数组。

var arr = [Any]() 
// Driving lat long co-ordinateds continues add in this array according to your expectation either update location or perticuler time duration.

// make GMSMutablePath of your co-ordinates
let path = GMSMutablePath()

    for obj in arr{

        print(obj)

        if let lat = (obj as? NSDictionary)?.value(forKey: PARAMETERS.LET) as? String{

            path.addLatitude(Double(lat)!, longitude: Double(((obj as? NSDictionary)?.value(forKey: PARAMETERS.LONG) as? String)!)!)

        }
    }

print(path) // Here is your traveling path
let km = GMSGeometryLength(path)
print(km) // your total traveling distance.

我是在this应用中完成的，它运行正常。 希望它能对您有所帮助：）

或不使用GoogleMaps

不过，根据您的代码，您必须自己提供位置，即CLLocationCoordinate2D数组。

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
    // MARK: - Variables
    let locationManager = CLLocationManager()

    // MARK: - IBOutlet
    @IBOutlet weak var mapView: MKMapView!

    // MARK: - IBAction
    @IBAction func distanceTapped(_ sender: UIBarButtonItem) {
        let locations: [CLLocationCoordinate2D] = [...]
        var total: Double = 0.0
        for i in 0..<locations.count - 1 {
            let start = locations[i]
            let end = locations[i + 1]
            let distance = getDistance(from: start, to: end)
            total += distance
        }
        print(total)
    }

    func getDistance(from: CLLocationCoordinate2D, to: CLLocationCoordinate2D) -> CLLocationDistance {
        // By Aviel Gross
        // https://stackoverflow.com/questions/11077425/finding-distance-between-cllocationcoordinate2d-points
        let from = CLLocation(latitude: from.latitude, longitude: from.longitude)
        let to = CLLocation(latitude: to.latitude, longitude: to.longitude)
        return from.distance(from: to)
    }
}

输出

Answer 2

给定CLLocationCoordinate2D数组的简单函数，用于计算距离（以米为单位）。使用reduce而不是数组迭代。

func computeDistance(from points: [CLLocationCoordinate2D]) -> Double {
    guard let first = points.first else { return 0.0 }
    var prevPoint = first
    return points.reduce(0.0) { (count, point) -> Double in
        let newCount = count + CLLocation(latitude: prevPoint.latitude, longitude: prevPoint.longitude).distance(
            from: CLLocation(latitude: point.latitude, longitude: point.longitude))
        prevPoint = point
        return newCount
    }
}

计算行程距离核心位置迅速

2 个答案: