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how to implement such function?
the steps are the following,
(1) press a button or something
(2) the screen separate two parts and show its content.
PS:
if I want to code by myself, what should I learning, for example, core animation or something?
JWFolders may be helpful in getting the stuff you need. Just like Tigeuro said Cocoa Controls is a really good resource.
Have fun with it, Objective-C is a fun language to tinker with.