react-native - (React Native - 使用 AWS Amplify) - 不变违规 : Native module cannot be null

Question

问题描述:

我正在使用此 AWS Amplify doc 在我的 React-Native 应用程序中实现推送通知并且使用 iOS 部分进行测试失败并出现错误“ Invariant Violation: Native module cannot be null ”，但是如果我测试( 即 获取设备 token 并发送推送通知)Android 部分有用。我在 iOS 上看到的错误截图如下:



到目前为止我所尝试的:

将 react-native 版本从 0.59.10 升级到 0.61.5

据此github post ，我还尝试安装以下内容:

@react-native-community/push-notification-ios

npm install aws-amplify@unstable

这个模块( aws-amplify@unstable )引入了一个错误😓说 TypeError: undefined is not an object (evalating '_core.Amplify.register') 所以我决定摆脱它。

使用 的最新软件包“@aws-amplify/pushnotification”:“^3.0.13”适用于 Android，但在 iOS 中，我又回到了原来的错误😓:“ 不变违规: native 模块不能为空 ”

目前我的 package.json 如下:

"dependencies": {
"@aws-amplify/pushnotification": "^1.1.4",
"@aws-amplify/analytics": "^1.3.3",
"@react-native-community/netinfo": "^5.7.0",
"@react-native-community/push-notification-ios": "^1.2.0",
"amazon-cognito-identity-js": "^4.2.1",
"aws-amplify": "^1.2.4",
"aws-amplify-react-native": "^4.2.0",
"axios": "^0.19.2",
"cache": "^2.3.1",
"react": "16.9.0",
"react-native": "^0.62.2"
}

让我睡一觉，明天早上继续调试..

Answer 1

经过数小时的调试，似乎有些版本不能很好地相互配合，我已经设法修复了错误“不变违规: native 模块不能为空”并让 Android 和 iOS 推送通知正常工作😊💪使用以下版本aws 放大库和@react-native-community/push-notification-ios:

"dependencies": {
"@aws-amplify/pushnotification": "^3.0.13",
"@aws-amplify/analytics": "^1.3.3",
"@react-native-community/netinfo": "^5.7.0",
"@react-native-community/push-notification-ios": "^1.0.2",
"amazon-cognito-identity-js": "^4.2.1",
"aws-amplify": "^3.0.13",
"aws-amplify-react-native": "^4.2.0",
"axios": "^0.19.2",
"cache": "^2.3.1",
"react": "16.9.0",
"react-native": "^0.62.2"
},

或者

"dependencies": {
"@react-native-community/push-notification-ios": "^1.2.0",
"@react-native-community/netinfo": "^5.7.0",
"@aws-amplify/pushnotification": "^3.1.2",
"@aws-amplify/analytics": "^1.3.3",
"@aws-amplify/core": "^3.3.2",
"amazon-cognito-identity-js": "^4.2.1",
"aws-amplify-react-native": "^4.2.0",
"aws-amplify": "^3.0.16",
"axios": "^0.19.2",
"cache": "^2.3.1",
"react": "16.9.0",
"react-native": "^0.62.2"
},

看来 AWS Amplify(iOS 推送通知模块)已从 react-native 核心切换到 @react-native-community/push-notification-ios。因此，由于此迁移，这里有一些更改，如果您遇到此问题，可能需要交叉检查:

第 1 步:更新 Podfile

删除 ' react RCTPushNotification' 从您的 Podfile (您可以在 ios 文件夹中找到)。:

pod 'React-RCTPushNotification', :path => '../node_modules/react-native/Libraries/PushNotificationIOS'

第 2 步:链接 PushNotificationIOS 库

步骤 2.1:自动链接

将以下 RNCPushNotificationIOS 添加到您的 podfile(您可以在 ios 文件夹中找到)。

pod 'RNCPushNotificationIOS', :path => '../node_modules/@react-native-community/push-notification-ios/RNCPushNotificationIOS.podspec'

然后通过运行以下命令安装 pod 依赖项: cd ios && pod install

第 2.2 步:手动链接(如果自动链接对您不起作用，请考虑使用此选项)

拖这个 PushNotificationIOS.xcodeproj 将文件 (node_modules/@react-native-community/push-notification-ios/ios) 添加到 Xcode 上的项目中(通常在 Xcode 上的 Libraries 组下):



添加 libRNCPushNotificationIOS.a 通过选择 Project Navigator -> Target -> Build Phrases -> Linked Binary with Libraries 进入链接的二进制文件(确保 libRNCPushNotificationIOS.a 存在)




第 3 步:增强 AppDelegate

步骤 3.1:更新 AppDelegate.h

在文件顶部添加以下内容:

#import <UserNotifications/UNUserNotificationCenter.h>

然后，添加 ' UNUserNotificationCenterDelegate ' 到如下所示的协议(protocol):

@interface AppDelegate : UIResponder <UIApplicationDelegate, RCTBridgeDelegate, UNUserNotificationCenterDelegate>

步骤 3.2:更新 AppDelegate.m

在文件顶部添加以下内容:

#import <UserNotifications/UserNotifications.h>
#import <RNCPushNotificationIOS.h>

将 AppDelegate.m 中的所有条目替换为 RCTPushNotificationManager 与 RNCPushNotificationIOS

然后，在 之前添加以下代码片段@结束 根据 react-native-community.push-notification-ios

// Required to register for notifications
- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
{
  [RNCPushNotificationIOS didRegisterUserNotificationSettings:notificationSettings];
}
// Required for the register event.
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
  [RNCPushNotificationIOS didRegisterForRemoteNotificationsWithDeviceToken:deviceToken];
}
// Required for the notification event. You must call the completion handler after handling the remote notification.
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
  [RNCPushNotificationIOS didReceiveRemoteNotification:userInfo fetchCompletionHandler:completionHandler];
}
// Required for the registrationError event.
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
{
  [RNCPushNotificationIOS didFailToRegisterForRemoteNotificationsWithError:error];
}
// Required for the localNotification event.
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
  [RNCPushNotificationIOS didReceiveLocalNotification:notification];
}

其他有用的提示!

whenever you update your package.json, do the following :

rm -rf -rf node_modules
yarn cache clean --force
yarn install
cd ios && pod install
React-native start -- --reset-cache

希望这对某人有帮助!