Draw a line using core graphics when touch moves in iphone?

Question

使用核心图形在iPhone中的屏幕上移动手指时如何画线。

Answer 1

You need to handle the touch events:

on touches began:

record the point & save it in an instance variable

on touches moved:

record the new ending point & save it in an instance variable

With these 2 points you can create a path & use Coregraphics to draw the path