Este tutorial te permitirá realizar componentes UI customizados (¿Existe esta definición en castellano?) que podrás editar directamente en la sección Utilities de Xcode (IBDesignable e IBInsepctable)… Un must que DEBES aprender.

a short tutorial on how to use IBInspectable and IBDesignable with a video demo. It should take you about 10 minutes to go through all the steps.

Origen: How to make awesome UI components in iOS 8 using Swift and XCode 6 – IBDesignable and IBInspectable