Problem with UIScrollView and UITabBar / UINavigationController

I created a new ViewController with xib-file and implemented a working (which means that I set the contentSize) ScrollView with an ImageView. But when I then use a TabBar or NavigationController to structure my app, t开发者_高级运维he scrolling won't work anymore.

I'm searching for the error since last week but I can't find it. Can anybody help me, please?

LLAP, CyDummy

I have no clue about the error but I recreated the project with the "Tab Bar Application" template and now it works...