How do I know when UIScrollView stops decelerating?

Question

I would like to add an animation when UIScrollView stops? How should I implement this? By using a timer and checking the decelerating value? Or I thought in 4.0 blocks are recommended.

score 5 · Accepted Answer · answered Mar 09 '11 at 12:21

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Use the UIScrollViewDelegate's scrollViewDidEndDecelerating: method. There's also scrollViewWillBeginDecelerating: to inform you that the scrollview is now slowing down.

answered Mar 09 '11 at 12:21

DarkDust

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Thanks a lot!! I also found this link useful:http://stackoverflow.com/questions/1969256/uiscroll-view-delegate-not-calling-scrollviewdidendscrollinganimation/4909621#4909621 – TiansHUo Mar 10 '11 at 04:16

score 1 · Answer 2 · edited May 23 '17 at 10:33

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Two things to remember here. First of all, set the delegate for the UIScrollView. Then implement your desired behavior in one or both of these delegate methods

-scrollViewDidEndScrollingAnimation:
-scrollViewDidEndDecelerating:

The difference between those two is explained in this nice answer.

edited May 23 '17 at 10:33

Community

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answered Mar 09 '11 at 17:27

Bartosz Ciechanowski

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score 0 · Answer 3 · answered Mar 09 '11 at 12:24

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Use scroll view delegate method

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScrollViewDelegate_Protocol/Reference/UIScrollViewDelegate.html#//apple_ref/occ/intfm/UIScrollViewDelegate/scrollViewDidEndDecelerating:

answered Mar 09 '11 at 12:24

visakh7

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How do I know when UIScrollView stops decelerating?

3 Answers3