尝试在 ios 设备上运行 React-Native 应用程序时，为什么所有 RCT... 引用“未定义符号”错误？

Question

我正在尝试在设备上运行我的第一个 React-Native 应用程序，但构建总是失败并出现以下错误：

ld: warning: directory not found for option '-L/Users/XXXX/Library/Developer/Xcode/DerivedData/nigh-hktjvygosupgnoaafsvgyowhzsqi/Build/Products/Debug-iphoneos/React'

ld: warning: directory not found for option '-L/Users/XXXX/Library/Developer/Xcode/DerivedData/nigh-hktjvygosupgnoaafsvgyowhzsqi/Build/Products/Debug-iphoneos/React'

ld: warning: directory not found for option '-L/Users/XXXX/Library/Developer/Xcode/DerivedData/nigh-hktjvygosupgnoaafsvgyowhzsqi/Build/Products/Debug-iphoneos/React'

ld: warning: ignoring file /Users/XXXX/Nigh/ReactNativeNigh/Nigh/ios/build/nigh/Build/Products/Debug-iphonesimulator/React/libReact.a, file was built for archive which is not the architecture being linked (arm64): /Users/XXXX/Nigh/ReactNativeNigh/Nigh/ios/build/nigh/Build/Products/Debug-iphonesimulator/React/libReact.a

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_RCTBridge", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_RCTBundleURLProvider", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_RCTConvert", referenced from:
      objc-class-ref in libRNGestureHandler.a(RNFlingHandler.o)
      objc-class-ref in libRNGestureHandler.a(RNForceTouchHandler.o)
      objc-class-ref in libRNGestureHandler.a(RNLongPressHandler.o)
      objc-class-ref in libRNGestureHandler.a(RNNativeViewHandler.o)
      objc-class-ref in libRNGestureHandler.a(RNPanHandler.o)
      objc-class-ref in libRNGestureHandler.a(RNGestureHandlerModule.o)
      objc-class-ref in libRNGestureHandler.a(RNGestureHandler.o)
      ...

React directory not found error

前面有几件事：

项目在 XCode 模拟器上运行良好。

我正在使用 cocoapods 并尝试从 xcWorkspace 而不是项目运行构建（尽管目标的完整路径是 /Users/XXXX/Nigh/ReactNativeNigh/Nigh/ios/nigh.xcodeproj 这让我有点困惑)。

我已经删除并重新安装了节点模块、链接并完成了新的 pod 安装。

看起来我所要做的就是将 React 添加到 Debug-iphoneos 文件夹，但我不知道该怎么做，或者这是否是解决方案。我的第一次尝试是确保 React 在 Scheme 的构建目标中。它是列表中第一个选中所有框的，除了出于某种原因它说 React(missing)。根据React Native / Xcode Upgrade and now RCTConvert.h not found，我从 Targets 列表中删除了 React(missing) 并尝试再次添加 React，但 React 甚至没有出现在列表中。此外，Pods/Products 文件夹显示 libReact.a 与其他 .a 文件不同，没有 Archive(?) 图标：

List of Pod/Products

这是 pod 文件：

require_relative '../node_modules/react-native-unimodules/cocoapods'

target 'nigh' do
  # Pods for nigh
  use_frameworks!

    # pod 'AWSCore', '~> 2.12.0'
    pod 'AWSCore', '~> 2.10.2'
    pod 'AWSAppSync', '~> 2.14.2'

  pod 'React', :path => '../node_modules/react-native', :subspecs => [
    'Core',
    'CxxBridge',
    'DevSupport',
    'RCTActionSheet',
    'RCTAnimation',
    'RCTBlob',
    'RCTGeolocation',
    'RCTImage',
    'RCTLinkingIOS',
    'RCTNetwork',
    'RCTSettings',
    'RCTText',
    'RCTVibration',
    'RCTWebSocket',
  ]

  pod 'yoga', :path => '../node_modules/react-native/ReactCommon/yoga'

  pod 'DoubleConversion', :podspec => '../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec'
  pod 'glog', :podspec => '../node_modules/react-native/third-party-podspecs/glog.podspec'
  pod 'Folly', :podspec => '../node_modules/react-native/third-party-podspecs/Folly.podspec'
  pod 'RNGestureHandler', :podspec => '../node_modules/react-native-gesture-handler/RNGestureHandler.podspec'
  pod 'RNReanimated', :podspec => '../node_modules/react-native-reanimated/RNReanimated.podspec'
  pod 'react-native-google-maps', path: '../node_modules/react-native-maps'  # Uncomment this line if you want to support GoogleMaps on iOS
  pod 'GoogleMaps'  # Uncomment this line if you want to support GoogleMaps on iOS
  pod 'Google-Maps-iOS-Utils' # Uncomment this line if you want to support GoogleMaps on iOS

  use_unimodules!


  pod 'RNVectorIcons', :path => '../node_modules/react-native-vector-icons'

  pod 'react-native-maps', :path => '../node_modules/react-native-maps'

  pod 'RNDeviceInfo', :path => '../node_modules/react-native-device-info'

  pod 'react-native-slider', :path => '../node_modules/@react-native-community/slider'

  pod 'react-native-notifications', :path => '../node_modules/react-native-notifications'

  pod 'react-native-cameraroll', :path => '../node_modules/@react-native-community/cameraroll'

  pod 'react-native-image-picker', :path => '../node_modules/react-native-image-picker'

  pod 'RNFS', :path => '../node_modules/react-native-fs'

end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    if target.name == 'react-native-google-maps'
      target.build_configurations.each do |config|
        config.build_settings['CLANG_ENABLE_MODULES'] = 'No'
      end
    end

    #if target.name == "React"
    #  target.remove_from_project
    #end
  end
end

我注释掉了 if target.name == "React" 块，但无论哪种方式都会出现错误。

我是否正确地假设问题在于 React 不在方案的构建目标中，如果是这样，有人知道如何包含它吗？如果没有，有谁知道真正的原因可能是什么/如何解决/解决它？

Answer 1

我相信您的问题来自 use_frameworks!，请尝试删除该行，再次删除 DerivedData、Pods、xcworkspace、Podfile.lock 和 pod install。

我上个月升级我的 RN 版本时遇到了这个问题。这个愚蠢的事情让我花了 1 周的时间才知道这个问题，并花了 20 分钟来解决。

希望有帮助