Flutter小技巧

1.动画重复给定的次数

 late AnimationController _controller;
  late Animation _animation;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _controller = AnimationController(vsync: this, duration: Duration(milliseconds: 100));
    _controller.addListener(() => setState(() {}));
    _animation = Tween(begin: 0.0, end: 16.0).animate(_controller);
  }

// 执行动画，1秒后超时取消
TickerFuture tickerFuture = _controller.repeat(reverse: true);
              tickerFuture.timeout(Duration(seconds:  1), onTimeout:  () {
                _controller.stop(canceled: true);
              });