IOS 显示和隐藏tabbar

-(void)hideTabBar:(UITabBarController*) tabbarcontroller {
    [UIViewbeginAnimations:nilcontext:NULL];
    [UIViewsetAnimationDuration:0.5];
    for(UIView*viewintabbarcontroller.view.subviews)
    {
        if([viewisKindOfClass:[UITabBarclass]])
        {
            [viewsetFrame:CGRectMake(view.frame.origin.x,480, view.frame.size.width, view.frame.size.height)];
        }
        else
        {
            [viewsetFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width,480)];
        }
 
    }
 
    [UIViewcommitAnimations];
 
 
 
 
 
}
 
-(void)showTabBar:(UITabBarController*) tabbarcontroller {
 
    [UIViewbeginAnimations:nilcontext:NULL];
    [UIViewsetAnimationDuration:0.5];
    for(UIView*viewintabbarcontroller.view.subviews)
    {
        NSLog(@"%@", view);
 
        if([viewisKindOfClass:[UITabBarclass]])
        {
            [viewsetFrame:CGRectMake(view.frame.origin.x,431, view.frame.size.width, view.frame.size.height)];
 
        }
        else
        {
            [viewsetFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width,431)];
        }
 
 
    }
 
    [UIViewcommitAnimations];
}