Question

I have a UIScrollView that is displaying a list of data.
Right now, when the user adds one more item to the list, I can extend the content size of the UIScrollView and scroll down smoothly using setContentOffset and YES to animated.

When the user removes an item from the list, I want to resize the content size of the UIScrollView, and scroll back up one step also in an animated fashion.

How can I get the ordering right? Right now, if I resize the content size before scrolling back up, the scroll isn’t animated.

I tried scrolling back up before resizing the content size, but that still didn’t give a smooth transition.

Is there a way to finish the scrolling animation BEFORE resizing the content size?

Thanks

Answer 1

Yes, you need to call the method to resize your content after the scroll view’s animation is complete. You can do that in the scroll view delegate’s scrollViewDidEndScrollingAnimation: method. Set your controller as the delegate, and implement that method.

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
     [scrollView setContentSize: newSize];
}

You don’t need a timer or a table view for this.