Catalyst By Tutorials Bringing Ios Apps To The Mac Marin Benčević by Marin Benčević, Nick Bonatsakis & Andy Pereira instant download after payment.

Since the introduction of the first iPhone, Apple has been building and maintaining
two parallel operating systems: macOS and iOS. Both are based on Darwin but
optimized for different types of interaction. As time passed, the apps and features on
macOS and iOS started to converge slowly. It became very common for developers to
create and support apps that ran on multiple types of Apple devices, from iPhone,
iPad and Mac.
The trouble with building an app that runs on both iOS and Mac is that you need to
learn and use two different UI frameworks: UIKit and AppKit. And, therefore need
to maintain two distinct codebases. While it is, of course, possible to share some
code using frameworks, the entirety of an app’s UI-related code effectively needs to
be done twice.
With the arrival of Catalyst, it’s now possible to bring an iPad app to the Mac using a
single, UIKit-based codebase. With minimal effort, your iPad app can function quite
well on macOS, and with a bit of additional effort, can become a world-class Mac
citizen