scrollViewDidScroll never called

Question

I have a Scrollview within View. I want to use the function scrollViewDidScroll to check and update the arrows (left right).

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

    NSLog(@"Did scroll");
    [self updateButtons];
}

It seems scrollViewDidScroll won't be called when I scroll left or right. I searched everything but didn't found a solution.

Hope someone has a solution.

score 55 · Accepted Answer · answered Dec 31 '12 at 00:16

55

The typical error is that "one does not simply set the delegate of a view". What you have probably forgotten is

theScrollView.delegate = self;

answered Dec 31 '12 at 00:16

score 25 · Answer 2 · answered Aug 16 '13 at 18:59

25

I had this "symptom" as well and lost about 2 hours of my life on it. I clearly had the delegate set correctly...but I did NOT know about setting the contentSize property on the scroll view. -.-

If you don't set that property, then the scroll view doesn't think there is anything to scroll to, and therefore will NOT trigger the expected scroll view methods.

answered Aug 16 '13 at 18:59

ghostatron

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3

Wow this is mean. Was exactly my problem. Thx. – Denis Apr 25 '14 at 18:49

score 0 · Answer 3 · answered Jun 15 '23 at 18:33

0

If you defined your UIScrollView in the xib, you can simply do a Ctrl-Drag, from the ScrollView to the Files Owner and set the delegate that way. Probably the easiest way to do it.

answered Jun 15 '23 at 18:33

PDG

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scrollViewDidScroll never called

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