不建议使用“‘vsync”，不应使用

Question

更新到颤振版本3.0.3后，我在尝试使用AnimatedSize小部件时收到此警告：

'vsync' is deprecated and shouldn't be used. This field is now ignored. This feature was deprecated after v2.2.0-10.1.pre..
Try replacing the use of the deprecated member with the replacement.

child: AnimatedSize(
   vsync: this,
   curve: Curves.easeIn,
   duration: Duration(seconds: 1),
   child: Text("test"),
),

那么替代者是什么呢？

Answer 1

double _size = 50.0;
  bool _large = false;

  void _updateSize() {
    setState(() {
      _size = _large ? 250.0 : 100.0;
      _large = !_large;
    });
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => _updateSize(),
      child: Container(
        color: Colors.amberAccent,
        child: AnimatedSize(
          curve: Curves.easeIn,
          duration: const Duration(seconds: 1),
          child: FlutterLogo(size: _size),
        ),
      ),
    );
  }

更多信息AnimatedSize

Answer 2

只要移开场地，就不需要了，

更新后的文档示例还删除了AnimatedSize类。