如何在 Flutter 中对状态构造函数变量进行操作？

如何解决如何在 Flutter 中对状态构造函数变量进行操作？

我想显示 homeWidget 中 wordCount 的变化

    return Scaffold(
      body: Column(
        children: [
          ...
          Expanded(
            flex: 1,child: RecorderView(
              onSaved: _onRecordComplete,wordCount:wordCount,),],);

变量wordCount依赖于RecordView方法：

我写这个是为了获取状态变量

class RecorderView extends StatefulWidget {
  final Function onSaved;
  final int wordCount;
  const RecorderView({Key key,@required this.onSaved,@required this.wordCount}) : super(key: key);
  @override
  _RecorderViewState createState() => _RecorderViewState();
}

class _RecorderViewState extends State<RecorderView> {

//in one method
    widget.wordCount++;
}

我想在这里添加 wordCount，但它说这是最后一个。如何在没有 final 的情况下从 homeWidget 继承 wordCount？我只想自动更改wordCount中的显示，谢谢！！

解决方法

您不能继承该变量，但是您可以将其初始化为来自小部件的值。

class RecorderView extends StatefulWidget {
  final Function onSaved;
  final int wordCount;
  const RecorderView({Key key,@required this.onSaved,@required this.wordCount}) : super(key: key);
  @override
  _RecorderViewState createState() => _RecorderViewState();
}

class _RecorderViewState extends State<RecorderView> {
int _wordCount;

@override
void initState() {
super.initState();
_wordCount = widget.wordCount;
}
}