ios - Back button text too long on navigation bar -

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I am working on my first iOS application. I'm using the navigation controller and I'm running into a small problem. The point is that the text of the back button is too long. Because the text is too long the title is not always centered. I thought about removing the back button, but then I loose the latch to return the feature. What is the best way to handle this?

You can call it every ViewController where you want the back button. 

  self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle: @ "" style: UIBarButtonItemStylePlain target: zero operation: zero];

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