使用FutureBuilder时为子对象设置动画

import 'package:flutter/material.dart';

class MyWidget extends StatelessWidget {
  Future<String> fetchData() async {
    // 模拟异步操作
    await Future.delayed(Duration(seconds: 2));
    return 'Data loaded';
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<String>(
      future: fetchData(),
      builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          // 加载中状态
          return CircularProgressIndicator();
        } else if (snapshot.hasError) {
          // 加载错误状态
          return Text('Error: ${snapshot.error}');
        } else {
          // 加载完成状态
          return FadeTransition(
            opacity: Tween<double>(begin: 0, end: 1).animate(
              CurvedAnimation(
                parent: animationController,
                curve: Curves.easeIn,
              ),
            ),
            child: Text('Data: ${snapshot.data}'),
          );
        }
      },
    );
  }
}