警告对话框按钮没有为 onwillPop 方法提供参数

Question

我想给 on will pop 方法提供参数来决定用户是否要退出，我使用了下面的方法..

Future<bool> showAlertDialog(BuildContext context){
    bool response;
    AlertDialog alert = AlertDialog(
      elevation: 24,
      content: Text("Çıkmak istediğinizden emin misiniz?"),
      actions: [
        TextButton(onPressed:(){
          response=true;
          return response;
          },
          child: Text("EVET")),
        TextButton(onPressed:(){
          response=false;
          return response;
          },
          child: Text("HAYIR")),
      ],
    );
    showDialog(
      context: context,
      builder: (_)=>alert);
  }

当用户按下 android 手机后退按钮时，警告框会看到我上面分享的内容，根据来自此方法的参数，应用程序将关闭或不关闭，为此我使用on 将显示如下所示的方法

onWillPop: ()async{
        var response = await showAlertDialog(context);
        return response;
      },

但是当用户点击“是”或“否”时什么也没有发生，我做错了什么，请帮助我

Answer 1

你应该return showDialog() 函数的布尔值

使用Navigator.of(context).pop(true);到return true & Navigator.of(context).pop(FALSE); to return false on button press.

    Future<bool> showAlertDialog(BuildContext context){
     AlertDialog alert = AlertDialog(
       elevation: 24,
       content: Text("Çıkmak istediğinizden emin misiniz?"),
       actions: [
         TextButton(onPressed:(){
           Navigator.of(context).pop(true);
         },
             child: Text("EVET")),
         TextButton(onPressed:(){

           Navigator.of(context).pop(false);

         },
             child: Text("HAYIR")),
       ],
     );
  return showDialog(
         context: context,
         builder: (_)=>alert);
   }

.

Answer 2

您可以在 yes/no 选项的点击操作上使用回调。

这是代码..

typedef YesOrNoTapCallback = Function(bool);

提醒对话框中的一些变化

Future showAlertDialog(BuildContext context, YesOrNoTapCallback isYesTapped) async {
    AlertDialog alert = AlertDialog(
      elevation: 24,
      content: Text("Çıkmak istediğinizden emin misiniz?"),
      actions: [
        TextButton(onPressed:(){

          isYesTapped(true);
        },
            child: Text("EVET")),
        TextButton(onPressed:(){

          isYesTapped(false);
        },
            child: Text("HAYIR")),
      ],
    );
    await showDialog(
        context: context,
        builder: (_)=>alert);
  }

这就是你如何在 onWillPop 中使用它

 onWillPop: () async {
        bool isPop = false;
        await showAlertDialog(context, (alertResponse) {
          Navigator.of(context).pop(); // This will dismiss the alert dialog
          isPop = alertResponse;
        });
        return isPop;
      },

警告对话框按钮没有为 onwillPop 方法提供参数

Alert dialog button doesnt give parameter to the on willPop method

android

ios

flutter

android-alertdialog