How to hide the "back" button in UINavigationController?

Add this Code

[self.navigationItem setHidesBackButton:YES];

I just found out the answer, in a controller use this:

[self.navigationItem setHidesBackButton:YES animated:YES];

And to restore it:

[self.navigationItem setHidesBackButton:NO animated:YES];

[UPDATE]

Swift 3.0:

self.navigationItem.setHidesBackButton(true, animated:true)

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