前言
CocoaPods搭建私有库过程中，有人碰到问题，根据反馈，我就不一一回复了，写篇文章统一回复。
反馈的问题
使用 pod lib create XXX 命令会出现下面这个问题：
```/Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object/helpers/build_settings_array_settings_by_object_version.rb:27:in <module:BuildSettingsArraySettingsByObjectVersion>': undefined methodto_set' for #<Array:0x007fbe0d0960c8> (NoMethodError)
Did you mean? to_s
from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object/helpers/build_settings_array_settings_by_object_version.rb:8:in <class:XCBuildConfiguration>' from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object/helpers/build_settings_array_settings_by_object_version.rb:4:in<module:Object>'
from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object/helpers/build_settings_array_settings_by_object_version.rb:3:in <class:Project>' from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object/helpers/build_settings_array_settings_by_object_version.rb:2:in<module:Xcodeproj>'
from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object/helpers/build_settings_array_settings_by_object_version.rb:1:in <top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object/build_configuration.rb:194:in<top (required)>'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project/object.rb:521:in <top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /Library/Ruby/Gems/2.3.0/gems/xcodeproj-1.5.8/lib/xcodeproj/project.rb:5:in<top (required)>'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /Users/liuchuan/LAXCategoryKit/setup/ProjectManipulator.rb:30:in run' from /Users/liuchuan/LAXCategoryKit/setup/ConfigureiOS.rb:73:inperform'
from /Users/liuchuan/LAXCategoryKit/setup/ConfigureiOS.rb:7:in perform' from /Users/liuchuan/LAXCategoryKit/setup/TemplateConfigurator.rb:85:inrun'
from ./configure:9:in `<main>'
To learn more about the template see https://github.com/CocoaPods/pod-template.git.
To learn more about creating a new pod, see http://guides.cocoapods.org/making/making-a-cocoapod.```
解决方案步骤：
1、在~/.cocoapods/repos目录，把Xcodeproj clone到该目录下；
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2、在~/.cocoapods/repos/Xcodeproj目录，执行终端命令：
gem build xcodeproj.gemspec
3、在~/.cocoapods/repos/Xcodeproj目录，执行终端命令：
sudo gem install ./xcodeproj-1.7.0.gem
注：在执行终端命令：sudo gem install ./xcodeproj-1.7.0.gem过程中，如果ruby版本过低，会出现问题：/usr/bin Operation not permitted。解决办法：将ruby升级到最新版本，重新安装CocoaPods。
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