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I have a UIViewController label that has its own text set with an external server. Add to viewDidLoad : 

  [self.view addSubview: label];   
 Server updates the text after a few minutes, and in the app I press a button which activates it:  
  [self.view setNeedsDisplay ];   
 But the text of the label is not updated until the app is re-compiled   
 
 
 How about  label.text = @" new title "; ?

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