Swift如何使用新颜色填充叠加层 [英] Swift how to fill in overlay with a new color

问题描述

我在填写叠加层时遇到问题.我想使用一种新的颜色.我在这里先向您的帮助表示感谢.

I am having trouble filling in the overlay. I would like to use a new color. Thanks for the help in advance.

func addBoundry()
    {
        var points=[CLLocationCoordinate2DMake(39.02, -76.9),CLLocationCoordinate2DMake(38.97, -76.9),CLLocationCoordinate2DMake(38.97, -77),CLLocationCoordinate2DMake(39.02, -77)]

        let polygon = MKPolygon(coordinates: &points, count: points.count)

        mapView.addOverlay(polygon)
    }

    let regionRadius: CLLocationDistance = 1000
    func centerMapOnLocation(location: CLLocation) {
        let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
                                                                  regionRadius * 2.0, regionRadius * 2.0)
        mapView.setRegion(coordinateRegion, animated: true)
    }
    func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
        if overlay is MKPolygon {
            let polygonView = MKPolygonRenderer(overlay: overlay)
            //polygonView.strokeColor = UIColor.magentaColor()
            polygonView.strokeColor = UIColor(red: 0/255.0, green: 180/255.0, blue: 0/255.0, alpha: 0.4)

            return polygonView
        }

        return nil
    }

推荐答案

如果要使用strokeColor为多边形设置轮廓，则必须为MKPolygonRenderer设置lineWidth.默认值为0.

If you want an outline to your polygon with strokeColor, you have to set lineWidth for your MKPolygonRenderer. The default value is 0.

但是，您说的是填充叠加层".如果要填写，请使用fillColor，而不是strokeColor.

But, you say "filling in the overlay". If your intent was to fill it in, you'd use fillColor, not strokeColor.

(当然，我还要确保您已正确指定了地图视图的delegate，并且您的rendererForOverlay都已被调用.在其中添加一个断点和/或log语句并确保该例程被正确调用.)

(Of course, I'd also make sure that you've specified the delegate of the map view, properly and that your rendererForOverlay is getting called at all. Add a breakpoint and/or log statement in there and make sure that routine is getting called properly.)

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