"iOS Dev-85" leverages touch touch events: Paint, Undo, clear, and picture saving functions for Artboards

(1) Effect

(2) Code download

http://download.csdn.net/detail/wsb200514/8251841

(3) Summary

The main "painting" function is done in the DrawRect function, and all paths or points are stitched in the Touchesbegan, touchesmoved, and touchesended three functions.

--Remember to setneedsdisplay refresh after each change.

--You can record each cgpoint point and then draw it with the cgcontextref context.

--You can also open a uibezierpath, then put Cgpoint in the path, and finally the Uibezierpath stroke out.

--Either way, these paths are stored in a large mutable array, and the Removeallobject and removelastobject of the mutable array can be cleared and undone.

"iOS Dev-85" leverages touch touch events: Paint, Undo, clear, and picture saving functions for Artboards