I want to present you some convenient code snippets I gathered for working.
All Xcode code snippets exist as a .plist files in ~/Library/Developer/Xcode/UserData/CodeSnippets/
You can simply copy all code snippets (.codesnippet) into this folder, restart Xcode and you should have all of them ready to use.
Note: Create the folder if it doesn't exist already. It is created by Xcode when user adds his first custom snippet.
All Xcode Themes exist as a .plist files in ~/Library/Developer/Xcode/UserData/FontAndColorThemes/ You can simple copy all themes (.dvtcolortheme) into this folder, restart XCode and you should have all of them ready to use. Now you can go to Xcode -> Preferences -> Fonts & Colors and select your theme.
The snippets starting with the pattern swift-... so you can just type in the XCode and they will show up for you for auto-completion.
swift-tableViewDataSource.codesnippet
swift-tableViewDelegate.codesnippet