UIViewPropertyAnimator with a UISpringTimingParameters timingParameters doesn't respect its duration when keyframes are involved

Originator:lap.felix
Number:rdar://39495559 Date Originated:17-Apr-2018 01:46 PM
Status:Open Resolved:
Product:iOS + SDK Product Version:iOS 11.3
Classification:UI/Usability Reproducible:Always
 
( FB5718374 )

Summary:
UIViewPropertyAnimator doesn’t respect its duration if keyframes are used and a UISpringTimingParameters object is passed as timingParameters. Keyframes work well with a normal duration.

Steps to Reproduce:
Initialize a UIViewPropertyAnimator with `- (instancetype)initWithDuration:(NSTimeInterval)duration timingParameters:(id <UITimingCurveProvider>)parameters` and pass 0.1 seconds as duration and a UISpringTimingParameters instance.

Then add an animation which includes keyframes and start the animator.

Expected Results:
The animation should last 0.1 seconds.

Actual Results:
The animation appears to have a linear curve and lasts 0.1 seconds

Version:
iOS 11.3

Notes:

Comments

Link to sample project

https://dsc.cloud/felix/UIViewPropertyAnimator-keyframes-bug.zip

By lap.felix at Oct. 27, 2019, 9:33 p.m. (reply...)

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