如何在我的mapkit中用不同的颜色快速绘制2条线

终于我找到了方法：

在全班最重要的地方

var toGo    : MKPolyline?
var toCome  : MKPolyline?

然后考虑到是否加载了：

                    var polyLineGoes = MKPolyline(coordinates: &coordinateGoes, count: coordinateGoes.count)
                    toGo = polyLineGoes
                    mapView.addOverlay(polyLineGoes)


                    var polyLineComes = MKPolyline(coordinates: &coordinateComes, count: coordinateComes.count)
                    toCome = polyLineComes
                    mapView.addOverlay(polyLineComes)

在课程结束时：

func mapView(mapView : MKMapView! , rendererForOverlay overlay: MKOverlay!) ->MKOverlayRenderer! {

    if overlay is MKPolyline {
        if ( toGo  != nil) && (toCome != nil ) {
            if overlay as? MKPolyline  == toGo {
                var polyLineRenderer = MKPolylineRenderer(overlay: overlay)
                polyLineRenderer.strokeColor = UIColor.redColor()
                polyLineRenderer.lineWidth = 3

                return polyLineRenderer
            } else if overlay as? MKPolyline  == toCome {
                print(overlay.description)
                var polyLineRenderer = MKPolylineRenderer(overlay: overlay)
                polyLineRenderer.strokeColor = UIColor.blueColor()
                polyLineRenderer.lineWidth = 3

                return polyLineRenderer
            }
        }
    }
    return nil

}