An extension on UIView to retrieve information about the animation context the view is currently in.

UIView+AnimationContext.swift

import UIKit

extension UIView {
  struct AnimationContext {
    public let duration: TimeInterval
    public let timingParameters: UITimingCurveProvider?
  }
}

extension UIView {
  var animationContext: UIView.AnimationContext? {
    guard let action = action(for: layer, forKey: "backgroundColor") as? NSObject, !(action is NSNull) else { return nil }
    
    let duration: TimeInterval
    let timingParameters: UITimingCurveProvider?
    
    if let animation = action as? CAAnimation {
      duration = animation.duration
      timingParameters = animation.timingFunction
    } else if let animator = action.value(forKeyPath: "animationObject") as? UIViewPropertyAnimator {
      duration = animator.duration
      timingParameters = animator.timingParameters
    } else {
      return nil
    }
    
    return UIView.AnimationContext(duration: duration, timingParameters: timingParameters)
  }
}