文章展示了处理snapshot的代码片段如下。
FutureBuilder<Post>(
future: post,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text(snapshot.data.title);
} else if (snapshot.hasError) {
return Text("${snapshot.error}");
}
// By default, show a loading spinner
我有一个小部件,它需要访问外部的RestorableBool。在我的应用程序中,我可以使用提供对该属性的小部件访问。这是因为RestorableBool是RestorableProperty的一个(间接)子类,它是一个ChangeNotifier。
示例:
class _MyWidgetState extends State<MyWidget> with RestorationMixin {
final RestorableBool _importantState = RestorableBool(false);
@override
String? get resto
我正在尝试将一个现有的用户池导入到我的扩容颤振应用程序。我成功地在扩容CLI中创建了一个用户池,并在Admin Console沙箱中创建了身份验证,但是当我执行以下操作时,会遇到权限问题:
amplify auth import
User: arn:aws:sts::*:assumed-role/us-east-1_*_Full-access/amplifyadmin is not authorized to perform: cognito-idp:ListUserPools on resource: *
// Copyright (c) 2021, Very Good Ventures
// https://verygood.ventures
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import 'dart:async';
import 'dart:developer';
import '
我没有一个mac开发与颤振,所以我使用共同煽动。当我构建应用程序时,我会得到一个错误。我找了很多次,但找不到原因。我不知道“档案失败”是什么意思,有人能帮我吗?
note: Build preparation complete
/Users/builder/clone/ios/Pods/Pods.xcodeproj: warning: The iOS deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions