React Native 0.64.1集成Notification Extension报sharedApplication不可用错误如何解决

当前报错是因为RichNotificationsExtension继承了外层抽象目标BrandName的所有依赖，包括React Native核心库、各类RN原生插件，这些依赖大量使用了App Extension不允许的sharedApplicationAPI，触发了编译限制。你之前将扩展target移到外部后找不到模块，是因为没有单独给扩展配置自身需要的依赖。

require_relative '../node_modules/react-native/scripts/react_native_pods'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'

platform :ios, '12.0' # 建议至少升级到12.0，兼容新版RN和Batch SDK
# 原抽象目标仅给主应用相关target继承
abstract_target 'BrandName' do
  config = use_native_modules!

  use_react_native!(
    :path => config[:reactNativePath],
    :hermes_enabled => false
  )

  permissions_path = '../node_modules/react-native-permissions/ios'
  pod 'Permission-Notifications', :path => "#{permissions_path}/Notifications"

  target 'BrandNameApp' do
    #Production-specific pods

    target 'BrandNameAppTests' do
        inherit! :complete
        # Pods for testing
    end
  end
  
  target 'BrandNameAppDevelopment' do
      #Development-specific pods
  end
  
  target 'BrandNameAppStage' do
      #Stage-specific pods
  end

  # Enables Flipper.
  use_flipper!()
end

# 通知扩展单独放在抽象目标外部，不继承主应用的RN相关依赖
target 'RichNotificationsExtension' do
  # 仅添加扩展自身需要的依赖
  pod 'BatchExtension-ObjC'
  platform :ios, '12.0'
end

post_install do |installer|
  react_native_post_install(installer)
  
  # 修正扩展target的编译配置
  installer.pods_project.targets.each do |target|
    if target.name == "RichNotificationsExtension"
      target.build_configurations.each do |config|
        # 保持扩展安全API校验开启，无需改为NO
        config.build_settings['APPLICATION_EXTENSION_API_ONLY'] = 'YES'
        # 保持系统版本和主应用一致
        config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '12.0'
      end
    end
  end
end

• 删除ios目录下的Podfile.lock、Pods文件夹，以及RichNotificationsExtension目录下自动生成的pod配置文件
• 执行pod install --repo-update重新安装依赖
• 打开.xcworkspace文件，确认RichNotificationsExtension的Build Phases中没有React Native相关的编译项
• 检查扩展的Require Only App-extension-safe API配置保持默认YES即可

不要给通知扩展添加任何React Native相关的依赖，扩展本身不需要加载RN运行时，仅需处理通知展示逻辑，Batch和主应用的联动配置在主应用target中完成即可。

内容的提问来源于stack exchange，提问作者Melanie Journe