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# ScaleTransition

缩放子控件动画,用法如下:

class AnimationDemo extends StatefulWidget {
  
  State<StatefulWidget> createState() => _AnimationDemo();
}

class _AnimationDemo extends State<AnimationDemo>
    with SingleTickerProviderStateMixin {
  AnimationController _animationController;
  Animation _animation;

  
  void initState() {
    _animationController =
        AnimationController(duration: Duration(seconds: 2), vsync: this);

    _animation = Tween(begin: .5, end: .1).animate(_animationController);

    //开始动画
    _animationController.forward();
    super.initState();
  }

  
  Widget build(BuildContext context) {
    return ScaleTransition(
      scale: _animation,
      child: Container(
        height: 200,
        width: 200,
        color: Colors.red,
      ),
    );
  }

  
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }
}
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效果如下: