UIImageView and UIScrollView zooming

Question

Do I actually need a UIPinchGestureRecognizer inside a UIScrollView to have the pinch working? If yes how do I do it? I am trying to implement what flipboard has, where it b

Answer 1

All you need to do is add your UIImageView (or any view you want to zoom) inside your UIScrollView.

Set your maximumZoomScale on your UIScrollView to any value higher than 1.0f.

Set yourself as the delegate of your UIScrollView and return the UIImageView in the viewForZooming delegate method.

That's it. No pinch gesture needed, no nothing. UIScrollView handles pinch zooming for you.