UIView frame animation not updating subviews layout - UIViewPropertyAnimator

Asked Aug 22 '17 at 11:35

Active Aug 22 '17 at 12:00

Viewed 494 times

I am trying to to a simple frame animation with UIViewPropertyAnimator. If I animate the frame, it works great.

The problem arrives when you add subviews with autolayout constraints. Subviews frames are calculated at the beginning of the animation and changed immediately instead of being done as the animation progresses.

Any idea on how to animate subViews as the view frame changes?

let frameChange = UIViewPropertyAnimator(duration: duration, curve: .easeInOut) {
    animatableCustomView.frame = finalFrame
}

frameChange.startAnimation()

My custom view is just a view with an ImageView inside constrained to all 4 edges to its superview.

edited Aug 22 '17 at 12:00

asked Aug 22 '17 at 11:35

Cristian Pena

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try calling `yourView.setNeedsUpdateConstraints()` and `yourView.updateConstraints()` – Febin Fathah Aug 22 '17 at 11:45
Would that be inside the animation block? – Cristian Pena Aug 22 '17 at 11:47
Is [this](https://stackoverflow.com/questions/44341283/how-to-use-uiviewpropertyanimator-with-auto-layout) related to what are you asking about? – Ahmad F Aug 22 '17 at 11:52
None of those solutions work, sadly. – Cristian Pena Aug 22 '17 at 11:59
Same thing happens if you add a Label inside the view that is animating its frame and the label needs to change from one line to two. – Cristian Pena Aug 22 '17 at 12:01
remove your auto layout constraints and use autoresizing tool of Xcode to add constraints, it creates constraints at runtime. – Krishnarjun Banoth Aug 22 '17 at 12:03
Check my answer in this link(https://stackoverflow.com/questions/45768584/how-to-align-uilabel-horizontally-with-the-profile-photo-image/45769836#45769836) to know how to use autoresizing tool briefly. – Krishnarjun Banoth Aug 22 '17 at 12:06
https://stackoverflow.com/questions/45422722/ios-autolayout-constraints-for-three-squares/45429247#45429247 - For more help to use autoresizing tool. – Krishnarjun Banoth Aug 22 '17 at 12:15
@CristianPena I'm having the same issue and stumbled across your question. What did you end up doing for this? – Matt Mc Feb 21 '18 at 05:26

UIView frame animation not updating subviews layout - UIViewPropertyAnimator

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