SplitView on macOS

[fousa]

When I use SheeKit on my Mac Catalyst app, I noticed that the modal was always presented as a SplitView. While there was no indication in my code that could lead to such a screen.

Here is a snippet of the code I wrote to present a modal as a form sheet:

VStack {
    ...
}
.shee(isPresented: $isPresentingAddExpense, 
      presentationStyle: .formSheet(), 
      onDismiss: { isPresentingAddExpense = false }) {
    NavigationView {
        ExpenseFormView()
    }
}

Is this a known issue?

[edudnyk]

Hi @fousa, this is not the issue of SheeKit. In SwiftUI, NavigationView is actually a Split View Controller when horizontalSizeClass is regular. You can check the Demo app of shee kit, where I override horizontal size class to make NavigationView work as Navigation Controller.

[fousa]

But when I replace the entire .shee( implementation with .sheet( it's displayed correctly. Isn't a SplitView shown when multiple views a positioned next to each other?

NavigationView {
    SomeMainView()
}

DetailView()

[edudnyk]

It might be that native .sheet(...) enforces .compact horizontal size class - you can verify that by getting it from environment in your sheet content. Shee Kit does not override the size class in environment. Also, please check which size class is in environment of the view from which you present the sheet, and let me know both outcomes.

[edudnyk]

After investigation, the native SwiftUI.sheet passes .regular horizontal size class to the content, but also it passes these private environment values:

EnvironmentPropertyKey<ExpandedSplitViewKey> = false, 
EnvironmentPropertyKey<SceneStorageValuesKey> = Optional(SwiftUI.WeakBox<SwiftUI.SceneStorageValues>(base: Optional(SwiftUI.SceneStorageValues))), 
EnvironmentPropertyKey<StoreKey<SceneBridge>> = Optional(SceneBridge: rootViewController = Optional(<_TtGC7SwiftUI19UIHostingControllerGVS_15ModifiedContentVS_7AnyViewVS_12RootModifier__: 0x7fe9c070dc80>)), 
EnvironmentPropertyKey<AppNavigationAuthorityKey> = Optional(SwiftUI.WeakBox<SwiftUI.AppNavigationAuthority>(base: Optional(SwiftUI.AppNavigationAuthority))), 
EnvironmentPropertyKey<Key> = Optional(SwiftUI.NavigationAuthority(host: Optional(<_TtGC7SwiftUI14_UIHostingViewGVS_15ModifiedContentVS_7AnyViewVS_12RootModifier__: 0x7fe9c070e400; frame = (0 0; 1366 1024); autoresize = W+H; gestureRecognizers = <NSArray: 0x600002d7d140>; layer = <CALayer: 0x600002353640>>))), 
EnvironmentPropertyKey<SystemColorSchemeKey> = light, 
EnvironmentPropertyKey<InputAccessoryKey> = WeakBox<InputAccessoryGenerator<SwiftUIToolbar>>(base: nil), 
EnvironmentPropertyKey<CanTakeFocusKey> = true, 
EnvironmentPropertyKey<TintAdjustmentModeKey> = Optional(SwiftUI.TintAdjustmentMode.desaturated), 
EnvironmentPropertyKey<ExplicitPreferredColorSchemeKey> = nil,

There is an obvious hack out there in SwiftUI with private environment EnvironmentPropertyKey<ExpandedSplitViewKey> = false, which SheeKit has no access to.