updated animate view down method (now with blocks)

new_animatedown.m

- (void)animateViewDown:(NSUInteger)size
{
    [self animateView:^(CGRect frame)
        {
          frame.origin.y -= size;
          frame.size.height += size;
          return frame;
        }
    ];
}

- (void)animateView:(CGRect (^)(CGRect))block
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];

    self.view.frame = block(self.view.frame);

    [UIView commitAnimations];
}