Applies alpha to status bar, but using private methods that would make app been rejected.

StatusBar alpha(unsafe)

    - (void) hideStatusbar:(BOOL)mustHide
    {
        UIView *statusBarView = [[UIApplication sharedApplication] valueForKey:[@[@"status", @"Bar"] componentsJoinedByString:@""]];
        statusBarView.alpha = mustHide ? 0 : 1;
    }