在 Flutter App 上运行 pod install 时出错

问题描述 投票：0回答：1

当我尝试在 iOS 上构建 Flutter 应用程序时，出现此错误：

### Error
    ```
    NoMethodError - undefined method `present?' for nil:NilClass
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer/podfile_validator.rb:100:in `validate_conflicting_external_sources!'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer/podfile_validator.rb:85:in `block in validate_pod_directives'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer/podfile_validator.rb:84:in `each'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer/podfile_validator.rb:84:in `validate_pod_directives'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer/podfile_validator.rb:40:in `validate'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer/analyzer.rb:225:in `validate_podfile!'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer/analyzer.rb:104:in `analyze'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer.rb:422:in `analyze'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer.rb:244:in `block in resolve_dependencies'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/user_interface.rb:64:in `section'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer.rb:243:in `resolve_dependencies'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/installer.rb:162:in `install!'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/command/install.rb:52:in `run'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/claide-1.1.0/lib/claide/command.rb:334:in `run'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/lib/cocoapods/command.rb:52:in `run'
    /Users/User/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/cocoapods-1.13.0/bin/pod:55:in `<top (required)>'
    /Users/User/.rvm/rubies/ruby-2.7.0/bin/pod:25:in `load'
    /Users/User/.rvm/rubies/ruby-2.7.0/bin/pod:25:in `<main>'
    /Users/User/.rvm/gems/ruby-2.7.0/bin/ruby_executable_hooks:22:in `eval'
    /Users/User/.rvm/gems/ruby-2.7.0/bin/ruby_executable_hooks:22:in `<main>'
    ```
    ――― TEMPLATE END ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
    [!] Oh no, an error occurred.
    Search for existing GitHub issues similar to yours:
    https://github.com/CocoaPods/CocoaPods/search?q=undefined+method+%60present%3F%27+for+nil%3ANilClass&type=Issues
    If none exists, create a ticket, with the template displayed above, on:
    https://github.com/CocoaPods/CocoaPods/issues/new
    Be sure to first read the contributing guide for details on how to properly submit a ticket:
    https://github.com/CocoaPods/CocoaPods/blob/master/CONTRIBUTING.md
    Don't forget to anonymize any private data!
    Looking for related issues on cocoapods/cocoapods...
     - pod install fails while trying to call present? on a nil when using activesupport 7.1.0
       https://github.com/CocoaPods/CocoaPods/issues/12089 [closed] [9 comments]
       a week ago
     - Unable to see XCode/SwiftUI Previews within CocoaPods frameworks
       https://github.com/CocoaPods/CocoaPods/issues/9275 [open] [58 comments]
       10 Sep 2023
     - "Error 'DT_TOOLCHAIN_DIR cannot be used to evaluate LIBRARY_SEARCH_PATHS, use TOOLCHAIN_DIR instead' in Xcode 15 beta 5"
       https://github.com/CocoaPods/CocoaPods/issues/12012 [closed] [94 comments]
       a week ago
    and 12 more at:
    https://github.com/cocoapods/cocoapods/search?q=undefined%20method%20%60present%3F%27%20for%20nil&type=Issues&utf8=✓
Error running pod install
Error launching application on iPhone 15 Pro Max.

默认的 Flutter Counter 应用程序运行良好。 我有一台配备 M2 Pro 芯片的 Macbook。

我尝试过： 1. 扑干净 扑扑酒吧得到 2. sudo arch -x86_64 gem install ffi 3. 光盘 arch -x86_64 pod 安装 4. 光盘 pod install --repo-update

ios flutter cocoapods podfile pod-install
1个回答
0
投票

您看到的错误消息与 CocoaPods（iOS 项目的依赖项管理器）的问题有关。好像是使用了一个叫present的方法造成的？在您的依赖项之一中的 nil 对象上。这是一个与 Ruby 相关的错误，因为 CocoaPods 是一个 Ruby gem。

尝试：

  1. 检查您的依赖版本： 首先，确保您使用的是 Flutter 和 CocoaPods 依赖项的正确版本。您可以检查 pubspec.yaml 文件中的 Flutter 依赖项以及 Podfile 中的 CocoaPods 依赖项。

  2. 更新 CocoaPods： 确保您安装了最新版本的 CocoaPods。您可以通过运行以下命令来更新 CocoaPods：

gem update cocoapods

  1. 检查Ruby版本： 确保您使用正确的 Ruby 版本。该错误表明您正在使用 Ruby 2.7.0。确保您的项目在 .ruby-version 文件或 Gemfile 中指定了正确的 Ruby 版本。

  2. 删除并重新安装 Pod： 删除 ios 目录中的 Pods 目录和 Podfile.lock 文件：

cd ios

rm -rf Pods Podfile.lock

然后，运行 pod install 重新安装依赖项：

pod install

  1. 更新颤振： 通过运行确保您使用的是最新版本的 Flutter：

flutter upgrade

  1. 检查 CocoaPods 插件问题： 如果您的项目中有任何 CocoaPods 插件或自定义配置，请检查它们是否导致问题。暂时删除它们并尝试在没有它们的情况下构建项目。

  2. 检查项目特定问题： 调查您的项目代码是否存在任何可能导致此问题的问题，例如库或插件的错误使用。

  3. 重新启动： 有时，只需重新启动计算机就可以解决与依赖项和构建相关的奇怪问题。

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