SwiftUI on macOS 14+ Finally Works - NavigationSplitView and Beyond

Fazm Team··2 min read

SwiftUI on macOS 14 Finally Clicked

Building macOS apps with SwiftUI before macOS 14 was an exercise in frustration. Navigation was broken, performance was inconsistent, and you spent more time working around framework bugs than building features. macOS 14 changed that.

NavigationSplitView Actually Works

The biggest win is NavigationSplitView. On earlier macOS versions, it had bizarre selection behavior, sidebar items would lose their highlight state, and programmatic navigation was unreliable. On macOS 14+, it just works. Two-column and three-column layouts render correctly. Selection state persists. Programmatic navigation does what you expect.

This matters because most macOS productivity apps use a sidebar-detail layout. When the foundation is broken, everything built on top of it is fragile. With a working NavigationSplitView, you can build real macOS apps that feel native without dropping down to AppKit for basic navigation.

Performance Improvements

SwiftUI on macOS 14 handles complex view hierarchies without the stuttering and lag that plagued earlier versions. LazyVGrid and LazyHGrid actually lazy-load content instead of rendering everything upfront. Scroll performance is smooth even with hundreds of items. View updates are more targeted, so changing one piece of state does not re-render the entire view tree.

What Still Needs AppKit

SwiftUI on macOS is not perfect yet. Complex text editing, custom drag and drop behaviors, and some menu bar interactions still work better with AppKit. The good approach is using SwiftUI for the overall app structure and dropping to AppKit via NSViewRepresentable for the specific components that need it.

Open Source macOS Apps

The best way to learn SwiftUI for macOS is reading open source projects that ship real apps. You see how experienced developers handle the edge cases that tutorials skip - state management across windows, handling multiple displays, keyboard shortcut conflicts, and accessibility support. Building in the open also means getting feedback from other macOS developers who have hit the same problems.

Fazm is an open source macOS AI agent. Open source on GitHub.

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