Animate UIView height from bottom to top

Question

I\'m doing a simple animation of UIView height so that it reveals.

By default it seems to be revealing from top to bottom, and I want it to reveal bottom to top.

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Answer 1

I really think the simplest way to accomplish this would be to animate BOTH the height and the y properties of the view. If they happen along the same curve, it should look completely seamless to the user. As you are animating the height to 0, also animate the y component to the original y + the original height.

UIView *view = ...;
float originalY = view.frame.origin.y;
float originalH = view.bounds.size.height;

[UIView animateWithDuration:1.2f delay:1.0f options:UIViewAnimationCurveEaseInOut animations:^{
    view.frame = CGRectMake(view.frame.origin.x, (originalY + originalH), view.bounds.size.width, 0);

}completion:^(BOOL finished) {
    NSLog(@"Animation is complete");
}];

I believe this would give the look and feel of a collapsing view. I haven't tried this out in code, but I see no reason why it wouldn't be possible like this.