iOS 7 custom back button

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This is not a bug, this how Back button looks in iOS 7. For example:

enter image description here

You should probably use the new concept for your application, and not to set background image for back button in iOS 7.

If you still want you back button have the same as it looked in iOS6 than you should probably create those back buttons manually:

- (void)loadView
{
    [super loadView];

    UIButton *backButton = [[UIButton alloc] initWithFrame: CGRectMake(0, 0, 60.0f, 30.0f)];
    UIImage *backImage = [[UIImage imageNamed:@"back_button_normal.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12.0f, 0, 12.0f)];
    [backButton setBackgroundImage:backImage  forState:UIControlStateNormal];
    [backButton setTitle:@"Back" forState:UIControlStateNormal];
    [backButton addTarget:self action:@selector(popBack) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
    self.navigationItem.leftBarButtonItem = backButtonItem;
}

-(void) popBack {
  [self.navigationController popViewControllerAnimated:YES];
}

Edit: Not to break Swipe Gesture (Here is a source)

self.navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;

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