LoadError - library not found for class Digest::SHA1 — digest/sha1

开启全局代理；

brew install ruby
或者更新ruby，如果提示已存在，也可以重新装，或者更新。

below command will overwrite the previous version

brew link --overwrite ruby

close this terminal and open new terminal.check your version

ruby -v

check issue resolve or not

ruby -r digest/sha1 -e 'p Digest::SHA1'

如果提示：can‘t find gem cocoapods (＞= 0.a) with executable pod (Gem::GemNotFoundException)

sudo gem update –system （可以不执行）
gem install cocoapods