Improve tabBar animation when hidden

Question

I've think about how to make the tabBar 's hidden animation more elegant and smoothly:

Here is how I implement:
So I just want to improve the animation, while the tabBar is suddenly, you know, disappear and hidden.

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
  [self.tabBarController.tabBar setHidden:YES];
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
  [self.tabBarController.tabBar setHidden:NO];
}

Any suggestion?

Answer 1

Try adding this method:

- (void)setTabBarHidden:(BOOL)tabBarHidden animated:(BOOL)animated
{
  if (tabBarHidden == _isTabBarHidden)
    return;

  CGFloat offset = tabBarHidden ? self.tabBarController.tabBar.frame.size.height : -self.tabBarController.tabBar.frame.size.height;

  [UIView animateWithDuration:animated ? 0.6 : 0.0
                        delay:0
       usingSpringWithDamping:0.7
        initialSpringVelocity:0.5
                      options:UIViewAnimationOptionCurveEaseIn|UIViewAnimationOptionLayoutSubviews
                   animations:^{
                     self.tabBarController.tabBar.center = CGPointMake(self.tabBarController.tabBar.center.x,
                                                                       self.tabBarController.tabBar.center.y + offset);
                   }
                   completion:nil];

  _isTabBarHidden = tabBarHidden;
}

Then you can call it like [self setTabBarHidden:YES animated:YES] and [self setTabBarHidden:NO animated:YES] to hide and show your bar, this will move it in and out of the screen instead of just make it instantly dissapear.

Don't forget to add a new bool property isTabBarHidden and also you can play with the values of the animation.