Flutter Bottom Sheet:如何在用户与工作表交互时更改高度

import 'package:flutter/material.dart';

class MyBottomSheet extends StatefulWidget {
  @override
  _MyBottomSheetState createState() => _MyBottomSheetState();
}

class _MyBottomSheetState extends State<MyBottomSheet> {
  double _sheetHeight = 200.0; // 初始高度为200

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Bottom Sheet'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('打开工作表'),
          onPressed: () {
            showModalBottomSheet(
              context: context,
              builder: (BuildContext context) {
                return StatefulBuilder(
                  builder: (BuildContext context, StateSetter setState) {
                    return Container(
                      height: _sheetHeight,
                      child: Column(
                        children: [
                          Text('工作表内容'),
                          RaisedButton(
                            child: Text('增加高度'),
                            onPressed: () {
                              setState(() {
                                _sheetHeight += 50.0;
                              });
                            },
                          ),
                          RaisedButton(
                            child: Text('减少高度'),
                            onPressed: () {
                              setState(() {
                                _sheetHeight -= 50.0;
                              });
                            },
                          ),
                        ],
                      ),
                    );
                  },
                );
              },
            );
          },
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyBottomSheet(),
  ));
}