如何正确实现 Amplify to Flutter

Question

在过去的几天里，我试图弄清楚如何解决我在使用 Amplify for Flutter 时遇到的问题：error: compiling for iOS 9.0, but module 'Starscream' has a minimum deployment target of iOS 11.0 和 Target of URI doesn't exist: 'package:amplify_core/amplify_core.dart'

我尝试过的事情：

1. 遵循文档https://docs.amplify.aws/start/getting-started/setup/q/integration/flutter 的教程。结果是：project directory/ios/Pods/AppSyncRealTimeClient/AppSyncRealTimeClient/Connection/AppSyncConnection/AppSyncSubscriptionConnection+ErrorHandler.swift:9:8: error: compiling for iOS 9.0, but module 'Starscream' has a minimum deployment target of iOS 11.0: project directory/build/ios/Debug-iphonesimulator/Starscream/Starscream.framework/Modules/Starscream.swiftmodule/x86_64-apple-ios-simulator.swiftmodule 和 Command CompileSwift failed with a nonzero exit code note: Using new build system note: Building targets in parallel note: Planning build note: Contructing build description。 我在 Podfile 上取消注释 platform :ios, '9.0' 并将其更改为 platform :ios, '11.0'，同时还将项目 xcworkspace 上的开发目标更改为 11。发生了同样的错误。

2. 遵循文档https://aws.amazon.com/getting-started/hands-on/build-flutter-app-amplify/ 的教程。当我尝试导入核心时，这导致：Target of URI doesn't exist: 'package:amplify_core/amplify_core.dart'。像那样，我不能使用 Amplify() 类。

3. 重新启动计算机。

4. 删除 Amplify 文件夹。

5. 运行amplify uninstall，并从头开始尝试。

6. 在此网站和其他网站上搜索其他帖子。

7. 正在运行amplify clean。

注意事项：

1. Amplify 安装、初始化和配置步骤未返回任何错误。
2. 如果我删除 Amplify 依赖项amplify_flutter: '<1.0.0' amplify_auth_cognito: '<1.0.0' amplify_analytics_pinpoint: '<1.0.0' 应用程序在模拟器上运行就好了。一旦我把它们放回去，错误就会返回。

Answer 1

您想将 import 'package:amplify_core/amplify_core.dart' 更改为 import 'package:amplify_flutter/amplify.dart'; 然后当您添加插件时，您会想要这样做 Amplify.addPlugins([authPlugin, storage]);

在执行此操作之前，我还运行了flutter upgrade，只要确保您保存所有更改即可。您可以在示例颤振应用中找到更多信息

https://github.com/aws-amplify/amplify-flutter/blob/master/example/lib/main.dart

Answer 2

如果你正在关注本教程https://docs.amplify.aws/start/getting-started/setup/q/integration/flutter

然后在依赖的步骤中有一个更正： https://docs.amplify.aws/start/getting-started/setup/q/integration/flutter#add-amplify-to-your-application

应该是这样的：

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2

dev_dependencies:

  amplify_flutter: <1.0.0
  amplify_datastore: <1.0.0
  amplify_api: <1.0.0
  amplify_auth_cognito: <1.0.0
  flutter_test:
    sdk: flutter
  

然后运行：

颤抖干净

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