I have a problem with UINavigationBar in iOS 6: if navigation bar has too long title, then second (there are two button items) of right bar button items becomes hidden. iOS 7 is okay (must be fixed)
How to prevent such behaviour?
For this you can customize the title label of UINavigationBar. You can set its minimumFontSize property so make the text adjustable.
OR
For iOS 6 you can use below code, so that you can provide a custom label:
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 120, 30)];
label.textAlignment = UITextAlignmentCenter;
[label setFont:[UIFont boldSystemFontOfSize:16.0]];
[label setBackgroundColor:[UIColor clearColor]];
[label setTextColor:[UIColor whiteColor]];
[label setText:text];
[self.navigationController.navigationBar.topItem setTitleView:label];