A set of custom code snippets for Xcode.
Learn more about xcode snippets in this blog of NSHipster.
Drag snippet to xcode code snippet library,then look the new created file in ~/Library/Developer/Xcode/UserData/CodeSnippets. Open "xxx.codesnippet", it's a plist file.
Install manually by copy-pasting in Xcode or with the ACCodeSnippetRepository Xcode Plugin.