Cocoapods

https://juejin.im/post/5d2ed9b0f265da1b971aa8f3
https://stackoverflow.com/questions/17968580/warning-path-is-not-properly-set-up-usually-this-is-caused-by-shell-initializa
https://juejin.im/post/5c1fb3696fb9a049af6d4132
https://www.cnblogs.com/duhuo/p/5695256.html