webview-container.swift

import SwiftUI
import WebKit

@main
struct WebViewActingUpApp: App {
    var body: some Scene {
        WindowGroup(id: "Main") {
            ContentView()
        }

        WindowGroup(id: "Secondary") {
            BrowserView()
        }
    }
}

struct BrowserView: View {
    @State var viewModel = ViewModel()
    
    var body: some View {
        WebView(viewModel: viewModel)
    }
}

struct ContentView: View {
    @Environment(\.openWindow) private var openWindow
    @Environment(\.dismissWindow) private var dismissWindow
    
    var body: some View {
        VStack {
            Button("Open") { openWindow(id: "Secondary") }
            Button("Close") { dismissWindow(id: "Secondary") }
        }
    }
}

@Observable
class ViewModel {
    var webView: WKWebView?
    
    @discardableResult
    func createWebView() -> WKWebView {
        if let webView { return webView }
        
        let webView = WKWebView()
        self.webView = webView
        
        return webView
    }
}

struct WebView: UIViewRepresentable {
    let viewModel: ViewModel
    
    func makeUIView(context: Context) -> some UIView {
        let containerView = UIView()
        
        let webView = viewModel.createWebView()
        webView.translatesAutoresizingMaskIntoConstraints = false
        webView.load(URLRequest(url: URL(string: "https://apple.com")!))
        
        containerView.addSubview(webView)

        NSLayoutConstraint.activate([
            webView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
            webView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
            webView.topAnchor.constraint(equalTo: containerView.topAnchor),
            webView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor),
        ])

        return containerView
    }

    func updateUIView(_ uiView: UIViewType, context: Context) {}
}