iphone tabbar pop or back to main view problem

1.

  When app. launch it's display loading screen.

2.

  After loading screen have another screen that contain 4 button.

3.

  If i select any button that after next screen No.开发者_如何学Go3  contain tabbar controller.

  So now i want to pop (or back to second)screen. but due to the tabbar controller on 3rd screen i can't go to back on second screen that the problem i faced now.

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You can put one ToolBar or NavigationBar on top in 3rd screen and put one button in that to go back to 2nd ViewController.
Best of luck.