xcode - iOS: change png in a bar button item -

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I have repeatedly put items in a bar, and I set it with a PNG (first page) And when I push it I want to change my PNG in "PGPNG"

This code does not work properly: 

  UIImage * first = [UIImage imageNamed: @ "Before .png"]; UIImage * Second = [UIImage imageNamed: @ "second.png"]; If ([sender is selected]) {[Sender Setizes: State for First: UControllStatEnormal]; [Sender set selected: no]; } Other {[Sender set image: State for second: UIControlState selected); [Sender set selected: yes]; }    
 
 
 current responder does not know that  UIBarButtonItem  does UIButton is not deprived, so the  setImage: forState:  will surely work  not  UIBarButtonItems  not  can be set to different states. You can  , however, use something like this (declared):  
  sender.image = [UIImage imageNamed: @ "first.png"];

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