objective c - UIBarButtonItem disappears when replacing DetailViewController, reappears after rotating -


After reading several sources related to this, I can only conclude that I should set my representative at the wrong time , But I can replace the details view controller on the selection of a table row in the master like this: 

  AppDelegate * app = (app deliit *) [[UIPAPRC share application]]]]; CustomerDetailViewController * newvc = [[CustomerDetailViewController alloc] initWithNibName: @ "CustomerDetailViewController" bundle: Zero with customer: [custData objectForKey: @ "name"]]; [App.detailNavigationController setViewControllers: [NSArray arrayWithObjects: newvc, zero]];   
 This view controller sets in the CustomerDetailViewController, I assign to the delegate:  
  - (id) initWithNibName: (NSString *) nibNameOrNil bundle: (NSBundle *) nibBundleOrNil {self = [super initWithNibName: nibNameOrNil bundle: nibBundleOrNil]; If (self) {AppDelegate * app = (AppDelegate *) [[UIApplication shared applicant]]]; App.splitViewController.delegate = self; } Healthy return; }   
 What happens if a strip is selected in the image bar, then I do not see barbitonism. However, if I rotate in the landscape and then come back to the portrait, barbutonium is visible.  
 I had thought of setting my representative in init, but this would not be obvious.  
 Can someone tell me where to assign to the delegate ??   
 
 
 I believe that I have found a solution - it seems like a duplicate of the question.

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