The UITableView does not scale to fit the screen.

Hi, I am a newbie
I have an UITabBar, and each UITabBarItem is related to an UINavigationController.
first I am in the root view under NavigationBar
then I click the button and navigated to another view, in this view, the navigation bar become higher because there is a a segment control.
And then, I click the return button on the navigation bar, return back to the root view.
I found that, the UITableView in the root view is not scaled to fit the screen now, the navigation bar .
and there is a space below the UITableView.
Questions:
1. By which delegate, I can detect the tab bar is clicked and switched by the user?
2. How to scale the UITableView to full fill the screen in Code?
Thx a lot

Check to see if you have the portrait lock activated. Double click the Home button to bring up the multitask bar. Swipe to the right until you get the iPod and volume screen. Check to the left is the rotation lock. If you can see the lock and arrow, you have the lock on, just click it again to turn it off.

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