ios - Need A Draw/Sketch Algorithm For IOS

Question

I'm working on a project in which I want to add a draw/sketch feature that draws by the user's touches on screen. That way they can make simple drawings on a view. This is a concept used in many picture apps (i.e. SnapChat). I've done many Google searches but haven't found anything out there that I could use. Does Apple have a guide or class for this or is there are any algorithms or code out there that's available to the public? Please provide me with references or information regarding this topic. Thanks in advance for your time.

Answer 1

我真的很喜欢 ray wenderlich 的教程。他们还有一个关于如何制作简单绘图应用程序的教程。

http://www.raywenderlich.com/18840/

我认为它应该给你一个关于绘图如何工作的提示。