hidesBackButton doesn't seem to work on ios 7

hidesBackButton doesn't seem to work on ios 7

How do I hide my back button on iOS 7?
I tried replacing it:
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem
alloc]initWithCustomView:homeButton];
and hiding it:
self.navigationItem.hidesBackButton = YES;
Both used to work but don't anymore on devices using iOS 7
Any help?
Thanks