Introduction in a nutshell (I don't like the verbosity of methods name)
In order to use these snippets, you have to git clone https://github.com/skyless/Snippets.git CodeSnippets into your ~/Library/Developer/Xcode/UserData/ folder.
Then Xcode must be closed and reopen to reload the awesome snippets.
OR if you already have some snippets of yours :
cd ~/Library/Developer/Xcode/UserData/CodeSnippets/
git init
git remote add origin https://github.com/skyless/Snippets.git
git pull origin master
alias: create this code