cocoapods组件化遇到的问题

搞了cocoapods组件化好几天了，刚入门就遇到问题，搞了一周，今天终于静下心来仔细揣摩。终于搞定了。记录下路程，给以后自己用，给别人用。

第一个问题：

使用 pod lib create XXX 指令，结果如法创建模版，错误提示如下

/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 method `to_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:in `require'
    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:in `require'
    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:in `require'
    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:in `require'
    from /Users/liuchuan/LAXCategoryKit/setup/ProjectManipulator.rb:30:in `run'
    from /Users/liuchuan/LAXCategoryKit/setup/ConfigureiOS.rb:73:in `perform'
    from /Users/liuchuan/LAXCategoryKit/setup/ConfigureiOS.rb:7:in `perform'
    from /Users/liuchuan/LAXCategoryKit/setup/TemplateConfigurator.rb:85:in `run'
    from ./configure:9:in `<main>'

To learn more about the template see `[https://github.com/CocoaPods/pod-template.git](https://github.com/CocoaPods/pod-template.git)`.
To learn more about creating a new pod, see `[http://guides.cocoapods.org/making/making-a-cocoapod](http://guides.cocoapods.org/making/making-a-cocoapod)`.

网上找了很多办法，终于找到一个和我一样问题的帖子：
http://www.cocoachina.com/bbs/read.php?tid-1742435.html
他在二楼贴了解决办法

解决了:
1.Clone this repo https://github.com/CocoaPods/Xcodeproj
2.gem build xcodeproj.gemspec
3.sudo gem install ./xcodeproj-.gem

刚开始我以为是命令，试了下行不通，正如帖子三楼中说的那样报错
原谅我知识不足。
实际上，上面说得不是命令，而是步骤。

1. 第一步：是克隆通过git克隆项目，命令其实是下面这句
   $ git clone https://github.com/CocoaPods/Xcodeproj
   克隆下来后。
2. 第二步：通过gem编译xcodeproj.gemspec
   执行$ cd Xcodeproj
   执行$ ls 命令可以看到以下目录
   屏幕快照 2018-11-06 下午10.48.35.png
   图中可以看到xcodeproj.gemspec文件
   执行$ gem build xcodeproj.gemspec
   编译成功！
3. 最后一步：安装 xcodeproj-.gem
   图中可以看到xcodeproj-1.7.0.gem
   这也第三步骤中说的 ./xcodeproj-.gem
   那么执行下面这句命令
   $ sudo gem install xcodeproj-1.7.0.gem
   这样就完成了。
   然后再回到我们想要做的事情，回到你想要的目录下，执行pod lib create XXX
   恭喜你！成功了！
   如果还是不行，那一定会遇到下面这个问题

---

问题又来了!：

我在执行$ sudo gem install xcodeproj-1.7.0.gem时提示权限不足：
ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /usr/bin directory.
于是我又开始找资料
终于在这个帖子中找到了方法
https://stackoverflow.com/questions/32810808/can-not-perform-pod-install-under-el-capitan-15a279b
按照上面答案说的那样sudo gem install -n /usr/local/bin cocoapods
我照葫芦画瓢输入了以下命令
$ sudo gem install -n /usr/local/bin xcodeproj-1.7.0.gem
终于执行成功。
接下来再回到我们想做的事情，回到你想要的目录下，执行pod lib create XXX
恭喜你！又成功了！