pod install unable to exec Xcode native xcrun (Permission denied)

pod install 出现

xcrun: error: active developer path ("/Applications/Xcode 2.app/Contents/Developer") does not exist, use `xcode-select --switch path/to/Xcode.app` to specify the Xcode that you wish to use for command line developer tools (or see `man xcode-select`)

以上错误 sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer 命令可以解决

安装rvm出现超时情况，一般翻墙后就会没有问题了