I have UIScrollView with multiple UIVIew subviews. I would like to update the data that is displayed by each UIView when they appear in the visible portion of the UIScrollView.
What is the callback that gets triggered? I tried viewWillAppear, but it does not seem to get called.
Thanks. :)
You have to do the calculation yourself. Implement scrollViewDidScroll:
in your scroll view delegate and calculate manually which views are visible (e.g. by checking if CGRectIntersectsRect(scrollView.bounds, subview.frame)
returns true.