Extracted from https://github.com/Maluen/react-native-calculator

reset-animation.js

startResetAnimation = () => {
  this.resetAnimation = Animated.timing(this.state.screenOpacityAnim, {
    toValue: 0,
    duration: 500,
  });
  this.resetAnimationFinished = false;
  this.resetAnimation.start(({ finished }) => {
    if (finished) {
      this.resetAnimationFinished = true;
    }
  });
}

cancelResetAnimation = () => {
  this.resetAnimation.stop();
  this.state.screenOpacityAnim.setValue(1);
}

finalizeResetAnimation = () => {
  if (this.resetAnimationFinished) {
    this.handleReset().then(() => {
      this.state.screenOpacityAnim.setValue(1);
    });
  } else {
    this.cancelResetAnimation();
  }
}