ios - setting title on navigation bar not working -

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I want to set the title in my navigation bar 

  [self.navigationItem setTitle : @ "Some title"];   
 However, the back button title is not changed to the navigation bar title.   
 
 
  self.navigationController.navigationBar.topItem.title = @ "myTitle"; In   
 or  
 or  
 H  
  IBOutletUnavigationHTML * navItem;   
 In. M  
  navItem.title = @ "new title";

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