Sometimes I need restrict the painting area in a PKCanvasView. I have tried mask the layer of PKCanvasView and it work fine.
But sometimes it is difficult to get the cgPath. I get the rect and maskImage by use floodfill, how to clip canvas context in PKCanvasView?
Code Block Swift let mask = CAShapeLayer() mask.path = cgPath canvasView.layer.mask = mask
But sometimes it is difficult to get the cgPath. I get the rect and maskImage by use floodfill, how to clip canvas context in PKCanvasView?
Code Block Swift context.clip(to: rect, mask: maskImage)