How to limited the UIScrollView Scroll width?

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I want the UIScrollView scroll 50 px each time, how can I limited it? thank you.

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This depends on how you want the effect to work. Implementing UIScrollViewDelegate will give you information when the user scrolls which should allow you to get whatever you are after. I did a similar thing where after the user scrolled I would move the content offset so that my button would always be in the middle.

For this I overrode scrollViewDidEndDragging and called setContentOffset to scroll to where I wanted.