flutter - statefulWidget 无法进行所需更改的问题

Question

我正在开发一个 statefulWidget，我的目的是确保在选择一个选项(用这种语言)之前，下一个按钮不可单击。然而它似乎不起作用，我还在代码中添加了Yaesin(回答的人)的答案

 ListView.builder(
            itemCount: histoires.length,
            itemBuilder: (context, index) {
              return ListTile(
                  title: Text(
                    histoires[index].title,
                    style: TextStyle(color: Colors.pink),
                  ),
                  trailing: IconButton(
                      icon: Icon(Icons.play_arrow),
                      onPressed: () {
                        showDialog(
                            context: context,
                            builder: (BuildContext context) {
                              return StatefulBuilder(
                                  builder: (context, setState) =>
                                      AlertDialog(
                                        content: Column(children: [
                                          InkWell(
                                              onTap: () {
                                                _handleTap;
                                              },
                                              child: ListTile(
                                                  trailing: Icon(Icons
                                                      .flag_circle_rounded),
                                                  title: Text(
                                                    "French",
                                                    style: TextStyle(
                                                        color: Colors
                                                            .blueGrey),
                                                  ))),
                                          _active
                                              ? InkWell(
                                                  onTap: () {},
                                                  child: Image.asset(
                                                      "assets/nextactive.png",
                                                      height: height * 0.2,
                                                      width: width * 0.4),
                                                )
                                              : Image.asset(
                                                  "assets/nextinactive.png",
                                                  height: height * 0,
                                                  width: width * 0)
                                        ]),
                                      ));
                            });
                      }));
            }),

Answer 1

要更新对话框 UI，您可以使用 StatefulBuilder 的 setState

 return StatefulBuilder(
    builder: (context, setState) =>  
      AlertDialog(
          content: Column(children: [

使用单独的方法时，将 StatefulBuilder 的 setState 传递给函数。对于您的情况，它将是

onPressed: () async {
  await showDialog(
      context: context,
      builder: (BuildContext context) {
        return StatefulBuilder(
            builder: (context, setStateSB) => AlertDialog(
                  content: Column(children: [
                    InkWell(
                        onTap: () {
                          _handleTap(setStateSB);
                        },
                        child: ListTile(

还要确保收到此 setStateSB(已重命名以避免与状态的 setState 混淆)。

_handleTap(setStateSB){ ....

有关使用StatefulBuilder的更多信息