ios - MKPolyLine 未显示在 Swift 2.0 中的 iOS 应用程序上

Question

我正在创建一种方向/GPS 应用程序，到目前为止一切都很简单。

• 我已经弄清楚如何查找用户的位置(当然要经过他们的许可)
• 我设法让他们能够轻松快捷地设置目的地

但是，我遇到了一个小问题。我想要的是用户在屏幕上选择目的地，应用程序将为他们提供到达目的地的最快方式。

这是我的 View Controller :

class ViewController: UIViewController,MKMapViewDelegate,CLLocationManagerDelegate {

    @IBOutlet var mapOfMaps: MKMapView!
    let locationManager = CLLocationManager()
    var center:CLLocationCoordinate2D!
    var SourcePM:MKPlacemark!
    let sourcePlacemark: MKPlacemark! = nil
    override func viewDidLoad() {
        super.viewDidLoad()

        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()
        self.locationManager.startUpdatingLocation()
        self.mapOfMaps.showsUserLocation = true

        let sourceAnnotation = MKPointAnnotation()

        if let location = locationManager.location {
            sourceAnnotation.coordinate = location.coordinate
        }
        let longPress = UILongPressGestureRecognizer(target: self, action: #selector(CardioViewController.action(_:)))
        longPress.minimumPressDuration = 1.0
        mapOfMaps.addGestureRecognizer(longPress)

        //directionRequest
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let location = locations.last
        center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.003, longitudeDelta: 0.003))
        self.mapOfMaps.setRegion(region, animated: true)
        self.locationManager.stopUpdatingLocation()
        SourcePM = MKPlacemark(coordinate: center, addressDictionary: nil)
    }
    func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
        print("ERROr " + error.localizedDescription)
    }

    func action(gestureRecognizer:UIGestureRecognizer) {
        let touchPoint = gestureRecognizer.locationInView(self.mapOfMaps)
        let newCoord:CLLocationCoordinate2D = mapOfMaps.convertPoint(touchPoint, toCoordinateFromView: self.mapOfMaps)

        let newAnotation = MKPointAnnotation()
        newAnotation.coordinate = newCoord
        newAnotation.title = "Your Destination"
        mapOfMaps.addAnnotation(newAnotation)
        let anotPM = MKPlacemark(coordinate: newAnotation.coordinate, addressDictionary: nil)


        let source = MKMapItem(placemark: SourcePM)
        let dstn = MKMapItem(placemark: anotPM)

        let directionRequest = MKDirectionsRequest()
        directionRequest.source = source
        directionRequest.destination = dstn
        directionRequest.transportType = .Automobile

        // Calculate the direction
        let directions = MKDirections(request: directionRequest)

        // 8.
        directions.calculateDirectionsWithCompletionHandler() {
            (response, error) in
            if(error == nil && response != nil) {
                for route in response!.routes {
                    var r: MKRoute = route as! MKRoute
                    self.mapOfMaps.addOverlay(r.polyline, level: MKOverlayLevel.AboveRoads)
                }
            }

            let route = response!.routes[0]
            self.mapOfMaps.addOverlay((route.polyline), level: MKOverlayLevel.AboveLabels)


            let rect = route.polyline.boundingMapRect
            self.mapOfMaps.setRegion(MKCoordinateRegionForMapRect(rect), animated: true)
        }

    }
    func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer {
        let renderer = MKPolylineRenderer(overlay: overlay)
        renderer.strokeColor = UIColor.orangeColor()
        renderer.alpha = 1
        renderer.lineWidth = 4.0

        return renderer
    }
}

帮助您完成我的代码。我的用户将按住 map 上的目的地，应用程序将添加注释，并且它应该给出路线。但是，所发生的只是注释将添加到 map 中，并且 map 将调整以显示两个位置(用户的位置和注释位置)，但不显示路线。

Answer 1

这可能不是“理想”的解决方案，但值得注意的是，两个 locationManager 功能不能同时工作。我尝试对 locationManager 函数之一进行评论，结果发现另一个函数运行良好