ios - Load UIViewController -

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I have a UIViewController with a black background and I do this: 

  CredenciaisViewController * Obj = [self.storyboard instantiateViewControllerWithIdentifier: @ "Creditian"]; [_viewContainer addSubview: obj.view]; _viewContainer.alpha = 1; The CredenciaisViewController has a red background color, but when it is light on my half  
 And when Ubuton does not work even in white part. > 
 Why does this happen? And how can I fix it?   
 
 
 I got it now! I have kept  
 and I did my action button:  
  - (IBAction) Most credentials: (ID) sender {credentials weave controller * credenciaisview = [ Self Storyboard Institution Visualistrologist identifier: @ "Credencial"]; [Add Child VUI Controller: credenciaisiew]; [CredenciaisView didoveParentViewController: self]; CredenciaisView.view.frame = self.containerView.bounds; [See Self.container Ad-view: credenciaisview view]; }   
 And then worked well!

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