相关疑难解决方法(0)

有没有办法拍摄mapView的截图并包含折线？我相信我需要在MKSnapShotter返回的图像上绘制CGPoint,但我不确定如何这样做.

目前的代码

      func takeSnapshot(mapView: MKMapView, withCallback: (UIImage?, NSError?) -> ()) {
    let options = MKMapSnapshotOptions()
    options.region = mapView.region
    options.size = mapView.frame.size
    options.scale = UIScreen.main().scale

    let snapshotter = MKMapSnapshotter(options: options)


    snapshotter.start() { snapshot, error in
        guard snapshot != nil else {
            withCallback(nil, error)
            return
        }

        if let image = snapshot?.image{



            withCallback(image, nil)

            for coordinate in self.area {

                image.draw(at:snapshot!.point(for: coordinate))

            }

        }

    }
}

我需要在UIImage中绘制/涂鸦一行,如上图所示,我在UIView上看到很多教程涂鸦线但在UIImage中没有.

用户在图像上涂鸦后,我想将其保存为新图像(具有线条的图像).我怎么在Swift中做到这一点？

我只能在UIView上找到绘制线而不是在UIImage中用于绘制UIView就像这个在youtube教程http://youtube.com/watch?v=gbFHqHHApC4中,我将其更改为继承DrawView到UIImageView

   struct  Stroke {
    let startPoint : CGPoint
    let endPoint : CGPoint
    let strokeColor : CGColor
}


class DrawView : UIImageView {

    var isDrawing = false
    var lastPoint : CGPoint!
    var strokeColor : CGColor! = UIColor.black.cgColor
    var strokes = [Stroke]()


    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

        guard !isDrawing else { return }
        isDrawing = true

        guard let touch = touches.first else {return}
        let currentPoint = touch.location(in: self)
        lastPoint = currentPoint
        print(currentPoint)


    }



    override …