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> between macOS System Preferences, iOS Settings

Why don’t those both use the same UI toolkit, like the convergent GNU/Linux DEs? (macOS seems to be getting more touch-optimized with each update — eg. making sliders giant and iOS-style; why hasn’t Apple merged Cocoa and Cocoa Touch into one yet?)

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AppKit and UIKit are very different. SwiftUI and Catalyst are the unification efforts, but uptake is gradual. Anyway, once you throw icloud.com into the mix it doesn’t matter.

You can already use SwiftUI to build apps that work on both macOS and iOS, so the libraries are there, Apple just needs to use.

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