If the background color is set for the view and the background image is set, then the eraser is set to remove the background mode. At this time, the eraser effect is a little bit wrong, and the background color is displayed on the top

[Codexiaofeifei]

This is a great library ，I would like to ask ，If the background color is set for the view and the background image is set, then the eraser is set to remove the background mode. At this time, the eraser effect is a little bit wrong, and the background color is displayed on the top