SwiftUI检查URL是否可达，并自动切换到ContentView

import SwiftUI
import Combine

class URLChecker: ObservableObject {
    @Published var isURLReachable = false
    
    init() {
        checkURLReachability()
    }
    
    func checkURLReachability() {
        guard let url = URL(string: "https://example.com") else { return }
        
        URLSession.shared.dataTask(with: url) { (_, response, _) in
            if let httpResponse = response as? HTTPURLResponse {
                self.isURLReachable = (200...299).contains(httpResponse.statusCode)
            }
        }.resume()
    }
}

struct ContentView: View {
    @ObservedObject var urlChecker = URLChecker()
    
    var body: some View {
        Group {
            if urlChecker.isURLReachable {
                Text("URL is reachable")
            } else {
                Text("URL is not reachable")
            }
        }
    }
}

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()
    }
}