TSMessageNotificationPositionNavBarOverlay doesn't work

[zhuochenming]

in - (id)initWithTitle:(NSString *)title
subtitle:(NSString *)subtitle
image:(UIImage *)image
type:(TSMessageNotificationType)aNotificationType
duration:(CGFloat)duration
inViewController:(UIViewController *)viewController
callback:(void (^)())callback
buttonTitle:(NSString *)buttonTitle
buttonCallback:(void (^)())buttonCallback
atPosition:(TSMessageNotificationPosition)position
canBeDismissedByUser:(BOOL)dismissingEnabled method,you should add the method of

    if (position == TSMessageNotificationPositionNavBarOverlay) {
        viewController.navigationController.navigationBarHidden = YES;
    }

in - (void)fadeOutNotification:(TSMessageView *)currentView animationFinishedBlock:(void (^)())animationFinished , you should add the method of

if (currentView.messagePosition == TSMessageNotificationPositionNavBarOverlay) {
    UIViewController *vc = currentView.viewController;
    vc.navigationController.navigationBarHidden = NO;
}