Goal for this project:

• Use a very simple calculator app to create re-usable view controllers that can be used without modification on either iOS or OS X.
• Create a very lightweight, durable solution. Use only native AppKit and UIKit classes identified by XKit typealiases. No subclassing or new classes. No swizzling or other changes to default behaviors.
• For APIs that differ between UIKit and AppKit, create simple Swift extensions to provide a unified interface that both iOS and OS X can use.
• Connect the same XKit view controller to both native iOS and OSX Storyboards.
• Maintain full access to all native AppKit and UIKit features.
• Keep full native speed in compiled projects.

Findings:

• iOS and OS X are close enough so that the full working app can be easily created using this technique.

Development team:

• Michael Patrick Ellard, concept and code.

Many thanks to Miguel Elasmar, who helped improve the iOS visual design significantly.