使用Pod集成ZEGOCLOUD CallKits SDK执行pod install时报错

我按照ZEGOCLOUD CallKits SDK的开发文档操作，执行pod install时出现报错，以下是我的Podfile配置和报错信息：

Podfile配置 #

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'CallKitsDemo' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!

  # Pods for CallKitsDemo
  pod 'ZegoUIKitPrebuiltCall'
  pod 'ZegoUIKitSignalingPlugin'

end

执行pod install后的报错信息 #

Analyzing dependencies
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/user_interface/error_report.rb:34:in `force_encoding': can't modify frozen String (FrozenError)
    from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/user_interface/error_report.rb:34:in `report'
    from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/command.rb:66:in `report_error'
    from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:396:in `handle_exception'
    from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:337:in `rescue in run'
    from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:324:in `run'
    from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/command.rb:52:in `run'
    from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/bin/pod:55:in `<top (required)>'
    from /usr/local/bin/pod:23:in `load'
    from /usr/local/bin/pod:23:in `<main>'
/Library/Ruby/Gems/2.6.0/gems/xcodeproj-1.21.0/lib/xcodeproj/project.rb:228:in `initialize_from_file': [Xcodeproj] Unknown object version (56). (RuntimeError)
    from /Library/Ruby/Gems/2.6.0/gems/xcodeproj-1.21.0/lib/xcodeproj/project.rb:113:in `open'
    from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:1190:in `block (2 levels) in inspect_targets_to_integrate'
    from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:1189:in `each'
    from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:1189:in `block in inspect_targets_to_integrate'

核心报错是[Xcodeproj] Unknown object version (56)，这是因为当前使用的CocoaPods（1.11.3）和xcodeproj（1.21.0）版本过低，不支持Xcode 14及以上版本生成的项目文件格式（object version 56对应Xcode 14）。

解决步骤：

1. 升级CocoaPods到最新版本
   执行命令：

sudo gem install cocoapods

若遇到权限问题，改用Homebrew安装：

brew install cocoapods

2. 更新本地Pod仓库

pod repo update

3. 重新执行pod install
   回到项目目录执行：

pod install

额外建议：在Podfile中指定iOS版本（ZegoUIKitPrebuiltCall最低支持iOS 12.0），将注释行# platform :ios, '9.0'改为：

platform :ios, '12.0'

内容的提问来源于stack exchange，提问作者Jim K