Prototype\wireframe\mockup tool for iOS for Mac OS X?

Question

Apple Developer Program

Tell me a service or application for creating prototypes / mockups of IOS applications.

Answer 1

I use OmniGraffle a lot. Thanks to the ability to add any graphic objects from primitives, on the Internet you can find an infinite number of ready-made sets for any task, be it UI, UML, ERD, and so on.
But if only for iOS application layouts, then you can find something easier.