List of Free code Photo Zoom
CollectionView Photo Layout
UICollectionViewLayout Simulating piles of photos. Pinch to zoom in/out. iOS 6+ required.
Full screen multimedia gallery from Journalized. Similar to the full screen view in the iPhone Photos app. Zoom and pan around images, swipe between media items, play videos.
Demo of paging through a scrollable set of images support single image zoom and clean device rotation.
iOS project which closely mimics the behavior of the Apple Photos app.
A single ObjC class which let you browse full size photos supporting zooming,paging,and smooth transforming animation between thumbnail imageviews.