使 UIViewPropertyAnimator 永远不会完成

问题描述

Problem Description

I have a UIViewPropertyAnimator managing a blur, among other things, and I'd like to use it just for its fractionComplete property. The problem is that if I set fractionComplete to 1.0, it completes and removes all animations, which I'd like to keep.

Basically, I don't want the animator to complete because that clears its animation blocks.

Workarounds considered

• Re-add animations upon completion
• Clamp fractionComplete to something like 0.001...0.999

解决方案

With iOS11 is now possible to set

var pausesOnCompletion: Bool { get set }

on the UIViewPropertyAnimator

source: https://developer.apple.com/documentation/uikit/uiviewpropertyanimator/2909004-pausesoncompletion

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