How to show/hide a UIView with animation in iOS?

Question

The main UIView contains two subviews - UIView_1 and UIView_2.
In the UIView_2, there is a button to show or hide the UIView_1.
For example, when a user touches the button to show the UIView_1, then UIView_1 will slide down and UIView_2 will push downwards with transition.
I have very little knowledge in animation. Can someone show me some sample code for reference?
Should I use CGAffineTransformMakeTranslation?
Thanks.

Answer 1

You don't need anything so complex. Just change the view's frame size.

    NSTimeInterval animationDuration = /* determine length of animation */;
    CGRect newFrameSize = /* determine what the frame size should be */;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:animationDuration];
    theViewToChange.frame = newFrameSize;
    [UIView commitAnimations];