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POStopping core animation on layer when some condition is met
 

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    <p>I'm trying to make 2 core animations that start at the same time and use the same curve but one of them need to be stopped if the condition is met. E.g. I have the following view on the left and want to transition to the right one.</p> <p><img src="https://i.stack.imgur.com/ydFvw.png" alt="enter image description here"></p> <p>The red views can be treated as overlays on top of yellow views even though in the beginning they are not intersecting. Imagine clicking 'item 3'. What I need to do is to animate movement of all rows to the top with distance <code>-item3.frame.origin.y</code> but once <code>title3</code> reaches top of the screen it should stay there so the remaining <code>item1</code> <code>item2</code> will look like they are sliding behind <code>title3</code></p> <p>I tried to animate all elements using core animation with option: <code>UIViewAnimationsOptionLayoutSubviews</code> and then in <code>layoutSubview</code> stop the animation with the following code:</p> <pre><code>-(void)layoutSubviews { CALayer* presentationLayer = (CALayer*)[self.title3.layer presentationLayer]; if (presentationLayer.frame.origin.y &lt;= 0) { [self.title3.layer removeAllAnimations]; } } </code></pre> <p>but without any success. Is there any way to make it work using core animation and without mocking with <code>CADisplayLink</code>. I can't use two seperate animations because the duration for title3 animations is hard to calculate which creates a gap between <code>title3</code> and <code>title2</code> if the animation curve is not linear.</p>
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