UIScrollView with centered UIImageView, like Photos app

I would like to have scroll view with an image content view. The image is actually map which is much bigger than the screen. The map should be initially in the center of the scroll view, like photos in Photos app when you turn iPhone to landscape orientation.

Photos app-like gap between pages in UIScrollView with pagingEnabled

UIScrollView in paging mode assumes the pages are located right next to each other, with no gap. However if you open a photo in the Photos app and swipe through photos, you can see that it has some gap between pages. I want these gaps too.

Getting the visible rect of an UIScrollView"s content

How can I go about finding out the rect (CGRect) of the content of a displayed view that is actually visible on screen.

Is it possible to tile images in a UIScrollView without having to manually create all the tiles?

In the iPhone sample code " PhotoScroller " from WWDC 2010, they show how to do a pretty good mimmic of the Photos app with scrolling, zooming, and paging of images. They also tile the images to show how to display high resolution images and maintain good performance.

Are there any good UIScrollView Tutorials on the net?

Any good links are highly appreciated! This goes to community wiki.

Twitter like App rejected [closed]

I have an App which is rejected which behaves as the Twitter App on the ground that:

CADisplayLink with NSRunLoopCommonModes not executed for every frame when tracking UIScrollView?

I am trying to execute a small piece of code on every single frame in a regular (non-OpenGL) iPhone app. The goal is to have a frame counter so that I can measure (rather than guess) where the slow points in the app are and fix them to create a better user experience.

UIScrollView not scrolling although contentSize is smaller than UIImageView

So I have a UIImageView as a subview of UIScrollView, I've set the contentSize to be smaller than the UIImageView width and height, however it doesn't allow me to scroll.. why is this? Here's some code: