Add LegacyApp

Author: Kyle-Ye

Sources/OpenSwiftUI/AppStructure/AppOrganization/internal/LegacyApp.swift

@@ -0,0 +1,34 @@
+//
+//  LegacyApp.swift
+//  OpenSwiftUI
+//
+//  Created by Kyle on 2024/1/9.
+//  Lastest Version: iOS 15.5
+//  Status: Complete
+//  ID: F8F4CFB3FB453F4ECC15C05B76BCD1E4
+
+public enum __App {}
+
+extension __App {
+    public static func run(_ rootView: some View) -> Never {
+        runApp(ShoeboxAdaptor(rootView: rootView))
+    }
+}
+
+extension __App {
+    private struct ShoeboxAdaptor<V: View>: App {
+        var rootView: V
+        
+        init() {
+            fatalError("Not a standalone App.")
+        }
+        
+        init(rootView: V) {
+            self.rootView = rootView
+        }
+        
+        var body: some Scene {
+            WindowGroup { rootView }
+        }
+    }
+}