UIScrollView in "U" shaped

I want to know whether it is possible to create a scrollview that has a "U" shape or 开发者_开发技巧consisting of any other curvy patterns??

Any ideas??

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You can write a Custom Gesture Recognizer to recognize a "U".

It involves implementing the following methods:

- (void)reset;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;

and doing the geometry to find the pattern you are looking for.

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For rendering, probably some kind of transform layer could help. For touch processing, however, you probably are on your own.