[objective-c] hide a tabbar animated

    [self.tabBarController.tabBar setFrame:CGRectMake(0, 431, self.tabBarController.tabBar.frame.size.width, self.tabBarController.tabBar.frame.size.height)];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2.0];
    [UIView setAnimationCurve:UIViewAnimationOptionTransitionCurlUp];
    [self.tabBarController.tabBar setFrame:CGRectMake(0, 480, self.tabBarController.tabBar.frame.size.width, self.tabBarController.tabBar.frame.size.height)];
    [UIView commitAnimations];