UIView's Backing CALayer Does Not Reenable Implicit Animations In Block
Originator: | minhtnguyen23 | ||
Number: | rdar://30041657 | Date Originated: | 16-Jan-2017 08:41 AM |
Status: | Open | Resolved: | |
Product: | iOS + SDK | Product Version: | |
Classification: | Core Animation | Reproducible: | YES |
Summary: According to official documentation, the UIView class disables layer animations by default but reenables them inside animation blocks. However, this behavior does not work as expected. In addition, actionForLayer:forKey: return NSNull (which effectively block implicit animation) both inside and outside of UIView's animation blocks. Steps to Reproduce: Create a UIView's animation block and modify any animatable property on the backing-layer of the view. Expected Results: The layer will perform an implicit animation of the property for 0.25 seconds. Actual Results: The layer immediately change the view's presentation of the property without any animation. Version: iOS 9, iOS 10, and possibly anything after 2014 Notes: Either this is a bug or the official documentation on Core Animation must update the expected behavior (e.g: Backing-layer no longer perform implicit animation inside/outside of UIView's animation blocks Configuration: Xcode 8.2.1, iOS 9 / 10 Devices
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