升级macOS Mojave后pod失效问题解决

升级macOS Mojave后pod失效

系统升级到10.14后，pod使用失效，报错：

/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.5.3/lib/cocoapods/command.rb:118:in `git_version': Failed to extract git version from `git --version` ("xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun\n") (RuntimeError)
   from /Library/Ruby/Gems/2.3.0/gems/cocoapods-1.5.3/lib/cocoapods/command.rb:130:in `verify_minimum_git_version!'
   from /Library/Ruby/Gems/2.3.0/gems/cocoapods-1.5.3/lib/cocoapods/command.rb:49:in `run'
   from /Library/Ruby/Gems/2.3.0/gems/cocoapods-1.5.3/bin/pod:55:in `'
   from /usr/local/bin/pod:22:in `load'
   from /usr/local/bin/pod:22:in `
'

提示：git --version找不到git的版本

我们只要安装git即可：
常规安装：xcode-select --install
升级系统需要手动安装git：从官网下载，完成后点击安装，pod就可以正常使用了。

cocoapods版本更新

1. sudo gem install cocoapods --pre
2. 发生错误时使用：
   sudo gem install -n /usr/local/bin cocoapods --pre

gem版本更新

sudo gem update --system