joseph-jo/MyPainter

A test project of drawing and erasing

MyPainter

A test project of drawing and erasing

I want to test some pen drawing and erasing snippets in this project.

1. Use the UIBezierPath and addQuadCurve to generate the curve line
2. Use the mask to implement the eraser
3. Combine the sublayers lower down the CPU usage

ref: https://medium.com/@almalehdev/high-performance-drawing-on-ios-part-1-f3a24a0dcb31

ref: https://stackoverflow.com/questions/57381552/how-to-create-an-eraser-for-calayer-sublayer-using-a-cashapelayer-in-swift