Feature: make Reader use center window

App/Scene Delegates/ReaderSceneDelegate.swift

@@ -0,0 +1,41 @@
+//
+//  ReaderSceneDelegate.swift
+//  App
+//
+//  Created by James Magahern on 8/22/22.
+//
+
+import UIKit
+
+internal enum ReaderUserActivityKeys: String {
+    case htmlString
+    case baseURL
+}
+
+class ReaderSceneDelegate: UIResponder, UIWindowSceneDelegate {
+    var window: UIWindow?
+    var readerViewController: ReaderViewController?
+
+    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions)
+    {
+        guard let windowScene = (scene as? UIWindowScene) else { return }
+        guard let activity = connectionOptions.userActivities.first else { return }
+        
+        guard let userInfo = activity.userInfo, let htmlString: String = userInfo[ReaderUserActivityKeys.htmlString.rawValue] as? String else { return }
+        let baseURL = userInfo[ReaderUserActivityKeys.baseURL.rawValue] as? URL
+        
+        let window = UIWindow(windowScene: windowScene)
+        
+        let readerViewController = ReaderViewController(readableHTMLString: htmlString, baseURL: baseURL)
+        readerViewController.title = activity.title
+        
+        self.readerViewController = readerViewController
+        window.rootViewController = UINavigationController(rootViewController: readerViewController)
+        
+        windowScene.title = activity.title ?? "Reader"
+        windowScene.sizeRestrictions?.maximumSize = CGSize(width: 700.0, height: 1000.0)
+        
+        window.makeKeyAndVisible()
+        self.window = window
+    }
+}