https://developer.apple.com/documentation/uikit/uiviewanimating/1649743-state

inactive

• 기본: .inactive
• 애니메이션 끝 → .inactive

active

• 애니메이션 시작(startAnimation(), pauseAnimation()) → .active
• fractionComplete 변경(0.0 ~ 1.0) → .active

stopped

• stopAnimation(_ :) 호출 → .stopped → finishAnimation(at :) 호출 → .inactive

state

The current state of the animation.

애니메이션의 현재 상태.

Required.

Declaration