Question

可以帮我制作带有附加参数Color的自定义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，我无法弄明白为什么。折线完全不可见。我是SWIFT的初学者，所以我认为问题在于我的CustomPolyline课程。谢谢你的帮助。

Answer 1

它可以比我更简单：

<强>类

import Foundation
import MapKit

class CustomPolyline : MKPolyline {

    var color: String?
}

<强>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;

    }

Answer 2

正如用户3470987指出的那样，修改默认的'rendererForOverlay＆＃39;可能会出现问题。委托功能。如果您想添加除MKPolyline以外的其他类型的叠加层，也可能会很困难。

类

import Foundation
import MapKit

class Polyline: MKPolyline {
    var color: UIColor?
}

渲染功能

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {

    if let polyline = overlay as? Polyline {

        let polylineRenderer = MKPolylineRenderer(overlay: polyline)
        polylineRenderer.strokeColor = polyline.color
        polylineRenderer.lineWidth = 3
        return polylineRenderer
    }

    return MKOverlayRenderer(overlay: overlay)

}

Answer 3

另一种最简单的解决方案：

extension UIColor {
    static var rendererColor: UIColor {
        return UIColor(red: 65/255, green: 65/255, blue: 65/255, alpha: 1)
    }
}

以及用途：

renderer.strokeColor = UIColor.renderer

如何使用附加参数 - 颜色在SWIFT中制作自定义MKPolyline

3 个答案: