轉自:http://www.tuicool.com/articles/URjqQvb

下載某個ios原始碼後，控制器進入目錄執行pod install：

$ pod install
Analyzing dependencies
[!] The version of CocoaPods used to generate the lockfile (0.39.0) is higher than the version of the current executable (0.35.0). Incompatibility issues may arise.

因此我們需要更新cocoapods，執行下面的命令，但是並沒有更新成功。

$ gem update cocoapod
Updating installed gems
    
Nothing to update

檢視當前版本：

$ pod --version
    
0.35.0

懷疑source地址有變化：

$ gem sources -l
*** CURRENT SOURCES ***
   
    
http://ruby.taobao.org/

網上檢視，告知taobao伺服器已經改為https協議，因此執行如下：

$ gem sources -r http://ruby.taobao.org/
http://ruby.taobao.org/ removed from sources
 

   
$ gem sources -a https://ruby.taobao.org/
https://ruby.taobao.org/ added to sources

更新系統，提示沒有許可權：

$ gem update --system 
Updating rubygems-update
Fetching: rubygems-update-2.5.1.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
    
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
 

使用sudo來執行操作：

$ sudo gem update --system
Updating rubygems-update
Fetching: rubygems-update-2.5.1.gem (100%)
Successfully installed rubygems-update-2.5.1
    
Parsing documentation for rubygems-update-2.5.1

執行安裝:

$ pod setup
Setting up CocoaPods master repo
Setup completed
   
[!] CocoaPods was not able to update the `master` repo. If this is an unexpected issue and persists you can inspect it running `pod repo update --verbose`

根據提示執行repo更新:

$ pod repo update --verbose
   
Updating spec repo `master`
  $ /usr/bin/git pull --ff-only
  From https://github.com/CocoaPods/Specs
     a0baa68..9a14a05  master     -> origin/master
  error: Your local changes to the following files would be overwritten by merge:
   CocoaPods-version.yml
   Specs/1PasswordExtension/1.0.0/1PasswordExtension.podspec.json
    
   Specs/1PasswordExtension/1.0.1/1PasswordExtension.podspec.json
   
    
   
   
 Specs/AKUTestKit/1.1.2/AKUTestKit.podspec.json
   Specs/ALCore
  Aborting
  Updating a5c6b67..9a14a05
   
   
   
[!] CocoaPods was not able to update the `master` repo. If this is an unexpected issue and persists you can inspect it running `pod repo update --verbose`

master分支還是失敗，檢視網上建議，先清除快取

rm -rf ~/.cocoapods/repos/master

再重新執行：

$ pod setup
Setting up CocoaPods master repo
   
CocoaPods 1.0.0.beta.2 is available.
To update use: `gem install cocoapods --pre`
[!] This is a test version we'd love you to try.
   
For more information see http://blog.cocoapods.org
and the CHANGELOG for this version http://git.io/BaH8pQ.
   
    
Setup completed

最後，到下載的ios工程目錄下，執行：

$ pod install
Updating local specs repositories
  
CocoaPods 1.0.0.beta.2 is available.
To update use: `gem install cocoapods --pre`
[!] This is a test version we'd love you to try.
  
For more information see http://blog.cocoapods.org
and the CHANGELOG for this version http://git.io/BaH8pQ.
  
Analyzing dependencies
Downloading dependencies
Installing AFNetworking (2.6.3)
Installing AFOnoResponseSerializer (1.0.0)
Installing DTCoreText (1.6.17)

可見現在問題解決了！