GetX-如何从Get返回值.对话框

Question

如何从get中获取返回值。打开对话框小部件/AlertDialog的对话框？

Answer 1

1。获取材料应用程序

在main.dart中，确保MyApp返回的是GetMaterialApp而不是MaterialApp

class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return GetMaterialApp( // <-- Use GetMaterialApp
title: 'Flutter Demo',
home: MyHomePage(title: 'Flutter Examples'),
);
}
}

这允许Get处理导航/路由，使导航方法可用，如：Get.to()、Get.dialog()、Get.back()等。如果没有GetMaterialApp作为应用程序的根目录，您在调用任何导航方法时都会看到(令人困惑的(错误：

E/flutter (11139): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: 
'package:flutter/src/widgets/localizations.dart': Failed assertion: 
line 453 pos 12: 'context != null': is not true.

2.Get.dialog+Get.back(结果：X(

让您对Get.dialog的调用期望一个异步返回值。。。

onPressed: () async {
// assign return value to an observable
return lx.result.value = await Get.dialog(

当使用Get.back(result: X)关闭对话框时返回，其中X是通过Get.dialog:返回的动态值

onPressed: () => Get.back(result: true),

完整示例：

import 'package:flutter/material.dart';
import 'package:get/get.dart';
class LoginX extends GetxController {
RxBool result = false.obs;
}
class GetDialogReturnPage extends StatelessWidget {
final LoginX lx = Get.put(LoginX());
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('GetDialog Return Example'),
),
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
child: Obx(() => Text('Value shows here: ${lx.result.value}')),
),
Container(
alignment: Alignment.center,
child: RaisedButton(
child: Text('Login'),
onPressed: () async {
// ** assign return value to an observable **
return lx.result.value = await Get.dialog(
AlertDialog(
content: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
RaisedButton(
child: Text('Good Login'),
onPressed: () => Get.back(result: true),
// ** result: returns this value up the call stack **
),
SizedBox(width: 5,),
RaisedButton(
child: Text('Bad Login'),
onPressed: () => Get.back(result: false),
),
],
)
)
);},
),
)
],
),
),
);
}
}