ios – 如何在Swift中使用MKPolylineView

我想在我的 Swift应用程序中绘制折线.

class MapViewController: UIViewController,MKMapViewDelegate {

    @IBOutlet var theMapView: MKMapView

    override func viewDidLoad() {
        super.viewDidLoad()
        setMapView()
    }

    func setMapView() {
        //theMapView.zoomEnabled = false
        //theMapView.scrollEnabled = false 
        theMapView.rotateEnabled = false  

        // 
        var lat: CLLocationDegrees = 37.586601
        var lng: CLLocationDegrees = 127.009381

        // 
        var latDelta: CLLocationDegrees = 0.008
        var lngDelta: CLLocationDegrees = 0.008

        var theSpan: MKCoordinateSpan = MKCoordinateSpanMake(latDelta,lngDelta)

        var initLocation: CLLocationCoordinate2D = CLLocationCoordinate2DMake(lat,lng)
        var theRegion: MKCoordinateRegion = MKCoordinateRegionMake(initLocation,theSpan)
        self.theMapView.setRegion(theRegion,animated: true)

        var locations = [CLLocation(latitude: 37.582691,longitude: 127.011186),CLLocation(latitude: 37.586112,longitude: 127.011047),CLLocation(latitude: 37.588212,longitude: 127.010438)]
        var coordinates = locations.map({(location: CLLocation) -> CLLocationCoordinate2D in return location.coordinate})
        var polyline = MKPolyline(coordinates: &coordinates,count: locations.count)

        var myPolylineView : MKPolylineView
        /* error */
        myPolylineView.polyline = polyline // #1
        myPolylineView.strokeColor = UIColor.blueColor() // #2
        myPolylineView.lineWidth = 5; // #3
        self.theMapView.addOverlay(myPolylineView) // #4
        /* ----- */    
    }
}

错误：

// #1 <br>
Cannot assign to 'polyline' in 'myPolylineView' <br>
// #2 <br>
'strokeColor' is unvailable: APIs deprecated as iOS 7 and earlier are unavailable in Swift <br>
// #3 <br>
'lineWidth' is unvailable: APIs deprecated as iOS 7 and earlier are unavailable in Swift <br>
// #4 <br>
Missing argument for parameter 'level' in call <br>

我找不到解决办法.

解决方法

首先,而不是MKPolylineView,您必须创建一个MKPolylineRenderer.

MKPolylineView自iOS 7以来已被弃用,尽管如果需要,您仍然可以在Objective-C中使用它,Swift不支持它.

其次,您必须在rendererForOverlay委托方法中创建并返回MKPolylineRenderer(不将其传递给addOverlay).

在addOverlay方法中,传递MKPolyline对象(不是MKPolylineView或MKPolylineRenderer).

(参见Adding MKOverlayPathRenderer as overlay to MKMapView gets exception,了解您传递给addOverlay的对象与您在rendererForOverlay中返回的对象之间的区别.

所以在setMapView方法中,删除创建和设置myPolylineView的行,并将addOverlay行更改为：

self.theMapView.addOverlay(polyline)

然后实现rendererForOverlay方法：

func mapView(mapView: MKMapView!,rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
    if overlay is MKPolyline {
        var polylineRenderer = MKPolylineRenderer(overlay: overlay)
        polylineRenderer.strokeColor = UIColor.blueColor()
        polylineRenderer.lineWidth = 5
        return polylineRenderer
    }

    return nil
}

确保地图视图的委托设置,否则代理方法将不会被调用,并且覆盖图不会显示.如果mapView是一个IBOutlet,连接委托插座或将其设置为代码(例如,在调用super后的viewDidLoad中)：

self.theMapView.delegate = self

ios – 如何在Swift中使用MKPolylineView

解决方法

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