CocoaPod 问题(I)

问题一

报错：_OBJC_CLASS_$_

方案：https://blog.csdn.net/duxinfeng2010/article/details/8265273

问题二：

 [!] Oh no, an error occurred.

 Search for existing GitHub issues similar to yours:
 https://github.com/CocoaPods/CocoaPods/search?q=%5BXcodeproj%5D+Unknown+object+version.&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...
  - RuntimeError - [Xcodeproj] Unknown object version.
    https://github.com/CocoaPods/CocoaPods/issues/7458 [closed] [12 comments]
     days ago

  - RuntimeError - [Xcodeproj] Unknown object version.
    https://github.com/CocoaPods/CocoaPods/issues/6992 [closed] [11 comments]
    a week ago

  - RuntimeError - [Xcodeproj] Unknown object version.
    https://github.com/CocoaPods/CocoaPods/issues/6991 [closed] [11 comments]
     Feb 

 and  more at:
 https://github.com/cocoapods/cocoapods/search?q=[Xcodeproj]%20Unknown%20object%20version.&type=Issues&utf8=✓
 HarelydeMacBook-Pro:testOne HuangGang$ gem install cocoapods --pre
 ERROR:  While executing gem ... (Errno::EACCES)
     Permission denied @ rb_sysopen - /Library/Ruby/Gems/2.3./gems/xcodeproj-1.5./LICENSE

以上的错误提示可以用下面的终端命令解决。

终端输入：

 sudo gem install -n /usr/local/bin cocoapods --pre