How to code zooming and panning for a UIImageView?

Question

I have a UIImageView object, attached to a controller. It displays fine. What is a easy way to get zooming and panning with the least amount of code? Perhaps some library out there that does this? Hard to believe the SDK does not provide anything.

Answer 1

UIScrollView is the SDK class you're looking for

Answer 2

Add your UIImageView as a subview of a UIScrollView and make sure you change the minimumZoomScale or maximumZoomScale.

Also take a look at the documentation for UIScrollView there might be other settings you want to tweak.

Answer 3

The Three20 project has a photo viewer you may want to look into, that I believe supports zooming and panning in a larger image.

Answer 4

Here is a nice post

http://blog.timeister.com/2009/09/02/objective-c-zoom-image/