How to sync scroll with multiple UIScrollViews?

Question

I have 2 UIScrollViews displaying an image each (overview and zoom mode). I can scroll in both views already individually, now I want to keep the centerpoint of both views in sync.

I guess when one of the views is creating events, I need to forward them also to the other view, just can't find out which functions are relevant. Any hints?

edit: If parallel live scrolling is not possible, I want to at least sync after a scroll event.

Answer 1

Check out the functions

• -setContentOffset:animated:
• -contentOffset
• -zoomScale
• -setZoomScale:animated:
• -zoomToRect:animated:

You can link this together in the delegate method -scrollViewDidScroll:, which is constantly called while the user is scrolling.