1.查看gems中本地程序包

gem list 可以看到红色的当前版本号

 

 

1.卸载pod 

sudo gem uninstall cocoapods 

sudo gem uninstall cocoapods -v 版本号

 

2.安装指定版本的CocoaPods

MacBook系统10.11.6之前：sudo gem install cocoapods -v 版本号

MacBook系统10.11.6之后：sudo gem install -n /usr/local/bin  cocoapods -v 版本号

1.更新pod没有权限：

错误现象：

gem install cocoapods ERROR: While executing gem ... (Gem::FilePermissionError):

在cocoapods 执行 sudo gem install cocoapods的时候出现  While executing gem ... (Gem::FilePermissionError)

    You don't have write permissions for the /usr/bin directory.

解决方法：改为 sudo gem install -n /usr/local/bin cocoapods  

 

 2.   更新最新版pod 报错：

错误现象：sudo gem install cocoapods——pre 报错：ERROR:  While executing gem ... (URI::InvalidURIError)

    URI must be ascii only "?gems=cocoapods\u{2014}\u{2014}pre"

 

解决方法：新版 sudo gem install -n /usr/local/bin cocoapods --pre

 旧版 sudo gem install cocoapods --pre     

然后 pod --version

 

 

2. 常见问题：