Migrando projeto Xcode antigo para um novo com UISceneDelegate

Question

Eu tenho um projeto Xcode antigo sem UISceneDelegatemétodos. É possível migrar um projeto Xcode antigo para um novo com UISceneDelegatemétodos, MAS ainda mantendo a compatibilidade com iOS 12?

Se sim, como? Porque vejo muitos bugs no iOS 14 para os quais a única solução alternativa é usar os métodos UISceneDelegate.

Answer 1

EDIT 1:

Certifique-se de consultar windowOrientation, após a exibição do View Controller ser renderizada. Normalmente em viewDidLoad()e viewWillAppear(_:), view.windowé nil, verifique esta resposta . Basta verificar o valor para windowOrientationem viewDidAppear(_:).

Se você tiver alguns problemas para acessar este valor antes mesmo, tente a seguinte definição

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
    }
}

Não tenho certeza se seu aplicativo usa várias janelas ou não, mas se houver apenas uma (já que você não está criando nenhuma janela programaticamente), a seguinte definição deve funcionar bem.

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

Resposta Original:

UISceneDelegatefoi introduzido de iOS 13.0forma nenhuma para ser compatível com iOS 12, você precisa depender UIApplicationDelegatetotalmente. Para oferecer suporte UISceneDelegatea iOS 13.x, você precisa adicionar verificação de disponibilidade explícita para evitar erros de compilação.

Etapas 1: Adicionar Scene Manifest em Info.plist

Abra Info.plistcomo Source Codee adicione o seguinte

<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>

Etapa 2: Criar SceneDelegate.swiftarquivo com o seguinte conteúdo

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.
    }


}

Etapa 3: Atualizar AppDelegate

1. Adicione UISceneSession Lifecyclemétodos.

// 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) Por fim, consulte a documentação da Apple . Você pode se referir ahttps://dev.to/kevinmaarek/add-a-scene-delegate-to-your-current-project-5on para tarefas adicionais de limpeza e configuração.