Flutter 如何按按钮打开颤振中的AlertDialog？

按下按钮后，我想打开一个AlertDialog，但前提是变量

bool showAlert

为true

这是我到目前为止的代码：

        FlatButton(
          child: Text("HIER"),
          onPressed: () {
            return AlertDialog(
              title: Text("HI"),
              content: Text("Are you there?"),
              actions: [
                FlatButton(child: Text("Yes"), onPressed: () {},),
                FlatButton(child: Text("No"), onPressed: () {},)
              ],
              elevation: 24,
            );
          },
        ),

对于我的问题（如果bool为true，则打开警报），问题是，警报对话框没有打开

---

有什么解决办法吗？感谢要显示AlertDialog，您需要一个showDialog，因此代码结果如下：

    FlatButton(
          child: Text("HIER"),
          onPressed: () {
            if(showAlert){
            showDialog(
                  //if set to true allow to close popup by tapping out of the popup
                  barrierDismissible: false, 
                  context: context,
                  builder: (BuildContext context) => AlertDialog(
              title: Text("HI"),
              content: Text("Are you there?"),
              actions: [
                FlatButton(child: Text("Yes"), onPressed: () {},),
                FlatButton(child: Text("No"), onPressed: () {},)
              ],
              elevation: 24,
            ),
          );
        }
      },
    ),

---

使用以下代码显示本机diolog依赖于平台：

FlatButton(
      child: Text("HIER"),
      onPressed: () {
        if (Platform.isIOS) {
          showCupertinoDialog(
            context: context,
            builder: (context) {
              return CupertinoAlertDialog(
                title: Text("HI"),
                content: Text("Are you there?"),
                actions: [
                  CupertinoDialogAction(
                    child: Text("Yes"),
                    onPressed: () {},
                  ),
                  CupertinoDialogAction(
                    child: Text("No"),
                    onPressed: () {},
                  )
                ],
              );
            },
          );
        } else {
          showDialog(
            context: context,
            builder: (context) {
              return AlertDialog(
                title: Text("HI"),
                content: Text("Are you there?"),
                actions: [
                  FlatButton(
                    child: Text("Yes"),
                    onPressed: () {},
                  ),
                  FlatButton(
                    child: Text("No"),
                    onPressed: () {},
                  )
                ],
                elevation: 24,
              );
            },
          );
        }
      },
    );

---

查看此代码，希望它能帮助您

openDialog(bool showAlert, BuildContext context) async {
if(!showAlert) return;
var result = await showDialog(
    context: context,
    builder: (BuildContext context) => AlertDialog(
              title: Text("HI"),
              content: Text("Are you there?"),
              actions: [
                FlatButton(child: Text("Yes"), onPressed: () {
                  Navigator.pop(context, true);
                },),
                FlatButton(child: Text("No"), onPressed: () {
                  Navigator.pop(context, false);
                },)
              ],
              elevation: 24,
            ),
  );

if(!(result ?? false)) {
// Yes click
}  else {
// No click
}

}

另类 GetX包

Get.dialog（）

以及许多其他脚手架组件。 对话框、Bottosheet、Snackbar、stateManagentgetx和obxbuilder等等。 访问pub.dev并搜索GetX