I have a SwiftUI-lifecycle Mac app that uses a standard NavigationSplitView. When it runs on macOS 26 Beta 3, I see invalid constraint messages in the debugger at launch and when I navigate around the app's UI:
Since this app is 100% SwiftUI, I'm not adding my own constraints. The invalid constraint is always the same. This has happened on every beta of macOS 26 and DOES NOT happen on macOS 14 or 15.
I've filed feedback reports with no answer. Has anyone else encountered this with the betas?
I've been heavily working with this beta since v1, and I've received this error, and many others relating to NavigationSplitView.
However, I believe every time it was relating to an issue in my code.
Various things to look out for: inspector, if you have a parent view with specific frame requirements, inset rules, custom layouts, etc.
Keep in mind I just recently picked up Swift + SwiftUI -- so I could be leaving out other important considerations.
If I were you, I would look at that error message -- here's a snippet that should help you debug your layout that is called out specifically:
import SwiftUI
@main
struct Application: App {
#if os(macOS)
// @NSApplicationDelegateAdaptor(Delegate.self) var delegate
#endif
init() {
#if DEBUG && os(macOS)
// Layout constraint debugging
UserDefaults.standard.set(true, forKey: "NSConstraintBasedLayoutVisualizeMutuallyExclusiveConstraints")
#endif
}
var body: some Scene {
WindowGroup {
Features.Shell.UI.Main()
.windowResizeAnchor(.center)
}
}
}
I apologize formatting may not be perfect