I've written a simple and easy to use photo browser called MWPhotoBrowser.
It is an implementation of a photo viewer that I wrote allowing the user to view one or more images in a similar way to the native Photos app. It can display one or more images by providing either UIImage objects, file paths to images on the device, or URLs images online. Photos can also be zoomed and panned.
View MWPhotoBrowser on GitHub
Hope this helps!
