React Native - iOS - 无效的 `Podfile` 文件：未定义的方法 `[]' 为 nil:NilClass

Question

我刚刚开始使用 React Native。我正在关注官方文档中的 React Native CLI 快速入门。这也意味着我是最新的 React Native 版本0.61.2。

从那以后我做了一些基本的 UI，在 iPhone 模拟器中检查结果。它在运行时有效react-native run-ios，并没有真正接触ios/Podfile太多。

我的问题是在我的ios/文件夹中运行pod install总是会导致错误！现在这成为一个问题，我需要安装其他软件包。但是它已经因为默认的 Podfile 失败了！

错误信息：

[!] Invalid `Podfile` file: undefined method `[]' for nil:NilClass.

 #  from /Users/marcel/Projekte/WerBinIch/ios/Podfile:43
 #  -------------------------------------------
 #  
 >    use_native_modules!
 #  end
 #  -------------------------------------------

ios/播客文件

platform :ios, '9.0'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'

target 'WerBinIch' do
  # Pods for WerBinIch
  pod 'FBLazyVector', :path => "../node_modules/react-native/Libraries/FBLazyVector"
  pod 'FBReactNativeSpec', :path => "../node_modules/react-native/Libraries/FBReactNativeSpec"
  pod 'RCTRequired', :path => "../node_modules/react-native/Libraries/RCTRequired"
  pod 'RCTTypeSafety', :path => "../node_modules/react-native/Libraries/TypeSafety"
  pod 'React', :path => '../node_modules/react-native/'
  pod 'React-Core', :path => '../node_modules/react-native/'
  pod 'React-CoreModules', :path => '../node_modules/react-native/React/CoreModules'
  pod 'React-Core/DevSupport', :path => '../node_modules/react-native/'
  pod 'React-RCTActionSheet', :path => '../node_modules/react-native/Libraries/ActionSheetIOS'
  pod 'React-RCTAnimation', :path => '../node_modules/react-native/Libraries/NativeAnimation'
  pod 'React-RCTBlob', :path => '../node_modules/react-native/Libraries/Blob'
  pod 'React-RCTImage', :path => '../node_modules/react-native/Libraries/Image'
  pod 'React-RCTLinking', :path => '../node_modules/react-native/Libraries/LinkingIOS'
  pod 'React-RCTNetwork', :path => '../node_modules/react-native/Libraries/Network'
  pod 'React-RCTSettings', :path => '../node_modules/react-native/Libraries/Settings'
  pod 'React-RCTText', :path => '../node_modules/react-native/Libraries/Text'
  pod 'React-RCTVibration', :path => '../node_modules/react-native/Libraries/Vibration'
  pod 'React-Core/RCTWebSocket', :path => '../node_modules/react-native/'

  pod 'React-cxxreact', :path => '../node_modules/react-native/ReactCommon/cxxreact'
  pod 'React-jsi', :path => '../node_modules/react-native/ReactCommon/jsi'
  pod 'React-jsiexecutor', :path => '../node_modules/react-native/ReactCommon/jsiexecutor'
  pod 'React-jsinspector', :path => '../node_modules/react-native/ReactCommon/jsinspector'
  pod 'ReactCommon/jscallinvoker', :path => "../node_modules/react-native/ReactCommon"
  pod 'ReactCommon/turbomodule/core', :path => "../node_modules/react-native/ReactCommon"
  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'


  target 'WerBinIchTests' do
    inherit! :search_paths
    # Pods for testing
  end

  use_native_modules!
end

我不知道如何处理这个！我不知道 Podfile 和 xcode 文件是如何工作的！我试图删除完成重置的文件夹。更重要的是，我不知道错误消息可能意味着什么。

Answer 1

当您 cd 到 ios 文件夹并运行“pod install”时会发生此错误，这是因为您添加了一个新的 react native 模块

npm -i包

而不是使用纱线

纱线添加包

要解决此问题，只需转到 package.json 所在的主要 react native 项目文件夹并再次运行以下命令

纱线缓存清洁

纱线添加包

然后尝试 cd 到 ios 文件夹并运行“pod install”，就不会再有错误了。希望这可以帮助其他也面临同样问题的人。

Answer 2

这个答案很好地解决了我的问题：

React-native ios Podfile 问题与“use_native_modules!”

这是正确的答案：

1 - 您Podfile应该在顶部包含此行

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

2 - 确保您的 package.json 和 node_module 文件夹已安装此模块

@react-native-community/cli-platform-ios

3 - 如果运行后没有找到yarn install- 意味着您的计算机中有旧的缓存node_modules，您需要在再次重新安装软件包之前清理它。

4 - 清理缓存

$ yarn cache clean

5 - 确保您拥有此文件react-native.config.js并且其配置有效 - 并且它没有不存在的 NPM 包 - 这一步是最后也是最重要的错误原因

我的例子react-native.config.js

module.exports = {
  project: {
    ios: {},
    android: {},
  },
  assets: ['./assets/fonts/'],
  dependencies: {}, // make sure this deps are all valid installed packages or empty if you don't need it
};

6 - 安装节点包yarn install，您的 pod 现在应该可以工作了！ $ pod install --repo-update

编码愉快！