cocopods安装出现的问题

报错：YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0).

ERROR:  SSL verification error at depth 1: unable to get local issuer certificate (20)

ERROR:  You must add /O=Digital Signature Trust Co./CN=DST Root CA X3 to your local trusted store

ERROR:  SSL verification error at depth 2: self signed certificate in certificate chain (19)

ERROR:  Root certificate is not trusted (/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA)

ERROR:  SSL verification error at depth 2: self signed certificate in certificate chain (19)

ERROR:  Root certificate is not trusted (/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA)

查看版本：rvm -v

查询结果：rvm 1.29.3 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]

获取版本：rvm list known

升级ruby版本：rvm install 2.3.0

错误结果：Error running '__rvm_make -j 1',

please read /Users/jiaweibo/.rvm/log/1510919754_ruby-2.3.0/make.log

There has been an error while running make. Halting the inst

错误结果：fatal: unable to access 'https://github.com/Homebrew/homebrew/': SSLRead() return error -9806 (这个原因是被墙了.)

我的解决办法是弄个代理,重新安装一遍,就OK了

可能是问题所在，其原因在于没有安装Xcode的CommandLineTools工具

执行下面的代码：xcode-select --install

会弹出安装框，一路next，完毕后就可以安装Ruby了

rvm install 2.3.0

最后安装或者升级cocoapods：sudo gem update/install cocoapods