Xcode14 创建适配iOS13的SwiftUI项目_swiftui ios 13

import SwiftUI
import UIKit
@main
struct SwiftUIDemoAppWrapper {
    staticfuncmain() {
        if#available(iOS14.0, *) {
            SwiftUIDemoApp.main()
        }else{
            UIApplicationMain(
                CommandLine.argc,
                CommandLine.unsafeArgv,
                nil,
                NSStringFromClass(SceneDelegate.self))
        }
    }
}

@available(iOS 14.0, *)
struct SwiftUIDemoApp: App {
    var body:someScene{
        WindowGroup {
            ContentView()
        }
    }
}

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import UIKit
import SwiftUI

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = UIHostingController(rootView: ContentView())
            self.window = window
            window.makeKeyAndVisible()
        }
    }

    func sceneDidDisconnect(_ scene: UIScene) {

    }

    func sceneDidBecomeActive(_ scene: UIScene) {

    }

    func sceneWillResignActive(_ scene: UIScene) {

    }

    func sceneWillEnterForeground(_ scene: UIScene) {

    }

    func sceneDidEnterBackground(_ scene: UIScene) {

    }
}

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到此，适配代码已经完成。运行一下，会发现启动后是黑屏。因为我们还需要在info.plist文件中配制：
将info文件用Source Code方式打开，添加如下代码：

   <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>
               </dict>
           </array>
       </dict>
   </dict>

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