flutter - 是否有办法在延迟一定延迟后处理或弹出窗口小部件？

Question

经过一段时间后，我试图处理加载动画，有什么办法可以实现？谢谢。

Answer 1

您可以在setState中更改小部件:

class _PageState extends State<Page> {
  Widget _loading = Container(child: Text("loading"));

  Future<void> _removeLoading() async {
    await Future.delayed(Duration(seconds: 30));
    setState(() {
      _loading = Container();
    });
  }

  @override
  void initState() {
    super.initState();
    _removeLoading();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: _loading,
      ),
    );
  }

或让一个 bool(boolean) 变量更改状态:

class _PageState extends State<Page> {
  boool _loading = true;

  Future<void> _stopLoading() async {
    await Future.delayed(Duration(seconds: 30));
    setState(() {
      _loading = false;
    });
  }

  @override
  void initState() {
    super.initState();
    _stopLoading();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: child: loading ? YourLoadingWidget : NotALoadingWidget
    );
  }