UINavigationController Back button doesn't hide title on iOS 11 : <p>I've updated my device to iOS 11 Beta yesterday and my app using this code in AppDelegate for hide back button title on all screen:</p>

<pre><code>@implementation UINavigationItem (Customization)

/**
 Removes text from all default back buttons so only the arrow or custom image shows up.
 */
-(UIBarButtonItem *)backBarButtonItem
{
    return [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
}
</code></pre>

<p>It's working normally on older version but when I run my app on iOS 11 Beta, the title of back button still shown.
Does anyone face this problem? Is it a beta version bug of iOS or iOS 11 need another way to hide the back button title?</p>
