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Project Catalyst:
UIKit on the Mac is finally here!
Tim Oliver
iOS Product Engineer (JP)
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In the beginning…
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Darwin (Kernel)
libSystem
Foundation
Core Graphics
Core Animation
AppKit UIKit
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AppKit (1994) UIKit (2005)
• 2 completely separate eras in Apple’s life
• UIKit improved upon what was in AppKit
• The concepts can be remarkably different
• It’s not easy to share code between platforms
• It’s not easy for UIKit engineers to transition to AppKit
• macOS misses out on a lot of great software
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chameleonproject.org
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It’s 2019 now!
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It’s 2019 now!
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Demo
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Key Takeaways
• Still just an iOS app. Adjusts for macOS.
• Resizable windows means ANY screen size.
• Provides hooks into AppKit. No direct access.
• Scaled down to 77% screen size for parity.
• All elements look like iOS by default.
• Precompiled binaries need to be recompiled
for `UIKitForMacOS`.
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Provides hooks into AppKit.
No direct access?
• Can use UIKit scenes to create
copies of UIKit windows.
• No way to create NSWindow
objects officially.
• Is it possible to make a UIKit/AppKit
hybrid?
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Using AppKit Bundles!
Beyond the Checkbox with Catalyst and AppKit
Steve Troughton-Smith - highcaffeinecontent.com
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Summary
• Check ‘Mac’ in Xcode to begin!
• Change view settings for native
macOS appearance.
• Re-consider design of elements
that do not look native.
• Consider using NSWindow when
necessary.
• Make some great apps!
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Thanks for watching! ✌
@TimOliverAU TimOliver