How to hide 'Back' button on navigation bar on iPhone?

The best way is to combine these, so it will hide the back button even if you set it up manually :

self.navigationItem.leftBarButtonItem=nil;
self.navigationItem.hidesBackButton=YES;

hide back button with bellow code...

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

[self.navigationItem setHidesBackButton:YES];

Also if you have custom UINavigationBar then try bellow code

self.navigationItem.leftBarButtonItem = nil;

Objective-C:
self.navigationItem.hidesBackButton = YES;

Swift:
navigationItem.hidesBackButton = true

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