Xcode provides generic templates that are located in:
- Mac templates:
/Applications/Xcode.app/Contents/Developer/Library/Xcode/Templates/ - iOS templates:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Templates/
File templates are located in ~/Library/Developer/Xcode/Templates/File Templates/.
You don't need to add extension like "ViewController" or "Cell". Templates will do that for you !