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.

Pitfall

Answer 1

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

theScrollView.delegate = self;

Villainous

Answer 2

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.

Saviour

Wow this is mean. Was exactly my problem. Thx. – Declarant

Answer 3

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.

Evanthe