ios - load viewcontroller within a tabbar control -

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I would like to display or pop up another view controller on the visual debilod of any of my tabbar view controllers. Here's my code 

  if (_history.count == 0) {// [self display CQU with identifier: @ "empty history history" sender: self]; UIStoryboard * sb = [UIStoryboard storyboardWithName: @ "main" bundle: zero]; MSAEmptyHistoryViewController * PopupController = [SB Instant Viewer Accessibilityfire: @ "Control History"]; [Self-present ViewController: Animated Popup Controller: Not Complete: Zero]; }   
 Load the view controller at the top of the tabviewie controller. I need to display this scene but still the user is allowed to see tabbar buttons.   
 
 
 If you try to transition to another view controller in  viewDidLoad  Problems you should either switch the controller to see the child of the tab bar controller, or you can submit a subview in one of the child view controllers.

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