如何创建一个可重用的Futurebuilder

import 'package:flutter/material.dart';

class ReusableFutureBuilder<T> extends StatelessWidget {
  final Future<T> future;
  final Widget Function(BuildContext, AsyncSnapshot<T>) builder;
  final T initialData;

  ReusableFutureBuilder({
    @required this.future,
    @required this.builder,
    this.initialData,
  });

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<T>(
      future: future,
      initialData: initialData,
      builder: (BuildContext context, AsyncSnapshot<T> snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return CircularProgressIndicator();
        } else if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        } else {
          return builder(context, snapshot);
        }
      },
    );
  }
}

ReusableFutureBuilder<String>(
  future: fetchData(),
  builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
    if (snapshot.hasData) {
      return Text(snapshot.data);
    } else {
      return Text('Loading...');
    }
  },
)

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