ios - 如何使用附加参数在 SWIFT 中制作自定义 MKPolyline - 颜色

Question

可以帮助我使用附加参数 Color 制作自定义 MKPolyline 吗？

CustomPolyline.swift

import Foundation
import MapKit
class CustomPolyline : MKPolyline {
    let coordinates: UnsafeMutablePointer<CLLocationCoordinate2D>
    let count : Int = 0
    let color : String = "ff0000"
    init(coordinates: UnsafeMutablePointer<CLLocationCoordinate2D>, count: Int, color: String) {

        self.coordinates = coordinates
        self.count = count
        self.color = color
    }
}

初始化

Polyline = CustomPolyline(coordinates: &Path, count: Path.count, color: "ff0000")
self.mapView.addOverlay(Polyline)

func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {      
        if (overlay is CustomPolyline) {
            var pr = MKPolylineRenderer(overlay: overlay);
            pr.strokeColor = UIColor.colorWithRGBHex(0xff0000).colorWithAlphaComponent(0.5);
            pr.lineWidth = 10;
            return pr;
        }

        return nil
    }

我的解决方案不起作用，我也不知道为什么。折线根本不可见。我是 SWIFT 的初学者，所以我认为问题出在我的 CustomPolyline 类上。 感谢您的帮助。

Answer 1

它可以比我想象的更简单:

类

import Foundation
import MapKit

class CustomPolyline : MKPolyline {

    var color: String?
}

初始化

cPolyline = CustomPolyline(coordinates: &Path, count: Path.count)
cPolyline.color = "#ff0000"
self.mapView.addOverlay(cPolyline)

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

            var pr = MKPolylineRenderer(overlay: overlay);
            pr.strokeColor = UIColor(rgba: overlay.color);
            pr.lineWidth = 10;
            return pr;

    }