Migrasi proyek Xcode lama ke yang baru dengan UISceneDelegate

Question

Saya memiliki proyek Xcode lama tanpa UISceneDelegatemetode. Apakah mungkin untuk memigrasi proyek Xcode lama ke yang baru dengan UISceneDelegatemetode TETAPI tetap menjaga kompatibilitas dengan iOS 12?

Jika ya, bagaimana caranya? Karena saya melihat banyak bug di iOS 14 yang satu-satunya solusi adalah menggunakan metode UISceneDelegate.

Answer 1

EDIT 1:

Pastikan Anda membuat kueri windowOrientation, setelah tampilan View Controller dirender. Biasanya di viewDidLoad()dan viewWillAppear(_:), view.windowadalah nil, periksa jawaban ini . Cukup periksa nilainya untuk windowOrientationmasuk viewDidAppear(_:).

If you have some issues to access this value even before try the following definition

private var windowOrientation: UIInterfaceOrientation {
    if #available(iOS 13.0, *) {
        return UIApplication.shared.windows.first?.windowScene?.interfaceOrientation ?? .unknown
    } else {
        // Fallback on earlier versions
        return UIApplication.shared.statusBarOrientation
    }
}

I am not sure if your app uses multiple windows or not but if there is only one(since you are not creating any window programatically), the following definition should work fine.

var hasTopNotch: Bool {
    return UIApplication.shared.windows.first?.safeAreaInsets.top ?? 0 > 20
}

Original Answer:

UISceneDelegate has been introduced in iOS 13.0 so no way to be compatible with iOS 12, you need to depend on UIApplicationDelegate totally. To support UISceneDelegate in for iOS 13.x, you need to add explicit availability checking to avoid compilation error.

Steps 1: Add Scene Manifest in Info.plist

Open Info.plist as Source Code and add the following

<key>UIApplicationSceneManifest</key>
<dict>
    <key>UIApplicationSupportsMultipleScenes</key>
    <false/>
    <key>UISceneConfigurations</key>
    <dict>
        <key>UIWindowSceneSessionRoleApplication</key>
        <array>
            <dict>
                <key>UISceneConfigurationName</key>
                <string>Default Configuration</string>
                <key>UISceneDelegateClassName</key>
                <string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
                <key>UISceneStoryboardFile</key>
                <string>Main</string>
            </dict>
        </array>
    </dict>
</dict>

Step 2: Create SceneDelegate.swift file with the following content

import UIKit
@available(iOS 13.0, *)
class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?


    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        guard let _ = (scene as? UIWindowScene) else { return }
    }

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system.
        // This occurs shortly after the scene enters the background, or when its session is discarded.
        // Release any resources associated with this scene that can be re-created the next time the scene connects.
        // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
    }

    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state.
        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
    }

    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state.
        // This may occur due to temporary interruptions (ex. an incoming phone call).
    }

    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground.
        // Use this method to undo the changes made on entering the background.
    }

    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background.
        // Use this method to save data, release shared resources, and store enough scene-specific state information
        // to restore the scene back to its current state.
    }


}

Step 3: Update AppDelegate

1. Add UISceneSession Lifecycle methods.

// MARK: UISceneSession Lifecycle
@available(iOS 13.0, *)
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
    // Called when a new scene session is being created.
    // Use this method to select a configuration to create the new scene with.
    return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
@available(iOS 13.0, *)
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
    // Called when the user discards a scene session.
    // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
    // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}

ii) Finally refer to Apple Documentation. You may refer to https://dev.to/kevinmaarek/add-a-scene-delegate-to-your-current-project-5on for additional clean up and setup tasks.