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POResizing UIView with autolayout when placed below a fixed size UIView
 

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  1. POResizing UIView with autolayout when placed below a fixed size UIView
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    <p>I am using autolayout with this layout:</p> <p><img src="https://i.stack.imgur.com/mqspM.png" alt="enter image description here"></p> <p>self.view with frame (0,80, 320, 488)</p> <p>collectionView with frame (0,0,320,220)</p> <p>underView with frame (0,220,320,268)</p> <p>and trying to achieve an animation which should resize underView enlarging its height such that underView partially covers collectionView moving bottom-up.</p> <p>Autolayout forces an height constraint for those 2 views hence I have created an IBOutlet for underView height constraint which I am tweaking in animation:</p> <pre><code>NSLog(@"underView height %.2f", self.underView.frame.size.height); NSLog(@"offset (%.2f, %.2f)", offset.x, offset.y); heightConstraint.constant += offset.y; NSLog(@"heightConstraint %.2f", heightConstraint.constant); [self.underView setNeedsUpdateConstraints]; [UIView animateWithDuration:ANIMATION_DURATION delay:ANIMATION_DELAY options:UIViewAnimationOptionCurveEaseOut animations:^{ [self.underView layoutIfNeeded]; NSLog(@"underView height %.2f", heightConstraint.constant); } completion:nil]; </code></pre> <p>And in the console I can see:</p> <pre><code>2013-07-30 09:09:37.268 Cal[49611:a0b] underView height 268.00 2013-07-30 09:09:37.268 Cal[49611:a0b] offset (320.00, 144.00) 2013-07-30 09:09:37.269 Cal[49611:a0b] heightConstraint 412.00 2013-07-30 09:09:37.270 Cal[49611:a0b] underView height 412.00 </code></pre> <p>But the resize does not happen at all.</p> <p>The only reason for this behavior I can think of is the height constraint of the collectionView above, but since I do not want the collection to reload I can not operate on that.</p> <p>I am wondering how to achieve having the underView enlarging OVER the collectionView? I tried using constraint priorities but it didn't work...</p>
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    1. USFabrizio Prosperi
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