Update

Other Projects/SplitView/Sources/SplitView/SplitView.swift

@@ -0,0 +1,22 @@
+import SwiftUI
+
+public struct SplitView<Master: View, Detail: View>: View {
+    public var master: Master
+    public var detail: Detail
+    @State public var preferredDisplayMode: UISplitViewController.DisplayMode
+
+    public var body: some View {
+        let controllers = [UIHostingController(rootView: master), UIHostingController(rootView: detail)]
+        return SplitViewController(controllers: controllers, preferredDisplayMode: $preferredDisplayMode)
+    }
+}
+
+public extension SplitView {
+    init(master: Master, detail: Detail) {
+        self.init(master: master, detail: detail, preferredDisplayMode: .automatic)
+    }
+
+    func preferredDisplayMode(_ preferredDisplayMode: UISplitViewController.DisplayMode) -> Self {
+        return SplitView(master: master, detail: detail, preferredDisplayMode: preferredDisplayMode)
+    }
+}

Other Projects/SplitView/Sources/SplitView/SplitViewController.swift

@@ -0,0 +1,18 @@
+import SwiftUI
+
+public struct SplitViewController: UIViewControllerRepresentable {
+    public var controllers: [UIViewController]
+    @Binding public var preferredDisplayMode: UISplitViewController.DisplayMode
+
+    public func makeUIViewController(context: UIViewControllerRepresentableContext<SplitViewController>) -> UISplitViewController {
+        let splitViewController = UISplitViewController()
+        splitViewController.preferredDisplayMode = preferredDisplayMode
+        splitViewController.viewControllers = controllers
+        return splitViewController
+    }
+
+    public func updateUIViewController(_ uiViewController: UISplitViewController, context: UIViewControllerRepresentableContext<SplitViewController>) {
+        uiViewController.preferredDisplayMode = preferredDisplayMode
+        uiViewController.viewControllers = controllers
+    }
+}