AnimationTimingFunc
public enum AnimationTimingFuncAn optional timing function defining the pacing of the animation.
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                  The default timing function. Use this function to ensure that the timing of your animations matches that of most animations. DeclarationSwift case defaultValue
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                  Linear pacing, which causes an animation to occur evenly over its duration. DeclarationSwift case linear
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                  Ease-in pacing, which causes an animation to begin slowly and then speed up as it progresses. DeclarationSwift case easeIn
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                  Ease-out pacing, which causes an animation to begin quickly and then slow as it progresses. DeclarationSwift case easeOut
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                  Ease-in-ease-out pacing, which causes an animation to begin slowly, accelerate through the middle of its duration, and then slow again before completing. DeclarationSwift case easeInEaseOut
 AnimationTimingFunc Enumeration Reference
      AnimationTimingFunc Enumeration Reference