NEW: Start my new Ultimate Portfolio App course with a free Hacking with Swift+ trial! >>

How to detect your iOS app is running on macOS Catalyst

Swift version: 5.2

Paul Hudson    @twostraws   

Although Catalyst does a good job of making UIKit work on macOS, you will quickly realize that some things that worked great on iOS just aren’t great fits for macOS.

So, if you want to detect when your iOS app is running on macOS using Catalyst, you can add an #if targetEnvironment check to provide alternative functionality, like this:

#if targetEnvironment(macCatalyst)
    print("UIKit running on macOS")
    print("Your regular code")

If that file also happens to support other platforms such as watchOS and tvOS, you can add further checks as needed like this:

#if targetEnvironment(macCatalyst)
    print("UIKit running on macOS")
#elseif os(watchOS)
    print("Running on watchOS")
    print("Your regular code")

Detecting Catalyst is particularly useful when removing behavior that, while appropriate on iOS itself, doesn’t look great on macOS. For example, having screens full of information slide onto a UINavigationController looks great on iPhone, OK on iPad, but downright ugly on macOS, so you might want to push view controllers without animation when running on Catalyst.

Hacking with Swift is sponsored by Fernando Olivares

SPONSORED Would you describe yourself as knowledgeable, but struggling when you have to come up with your own code? Fernando Olivares has a new book containing iOS rules you can immediately apply to your coding habits to see dramatic improvements, while also teaching applied programming fundamentals seen in refactored code from published apps.

Try the book!

Sponsor Hacking with Swift and reach the world's largest Swift community!

Available from iOS 13.0

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 5.0/5

Unknown user

You are not logged in

Log in or create account

Link copied to your pasteboard.