SwiftUIでSFSafariViewControllerコーディングを簡単に行う

SFSafariViewControllerはナビゲーション時の振る舞いや状態管理を自身で有しているので、予めUIViewControllerRepresentable化してSwiftUIで制御しようとするとコーディングが複雑になる。なのでそれを簡単に行えるパターンを考えてみた。

import SwiftUI
import SafariServices

public struct RepresentControllerView: UIViewControllerRepresentable {
    private var uiViewController: UIViewController
    
    public init(uiViewController: UIViewController) {
        self.uiViewController = uiViewController
    }
    
    public func makeUIViewController(context: Context) -> UIViewController {
        uiViewController
    }
    
    public func updateUIViewController(_ uiViewController: UIViewController, context: Context) {}
}

public final class HostingController<Content: View>: UIHostingController<Content>, ObservableObject {}

public struct HostingControllerView<Content: View>: View {
    private var c: HostingController<Content>
    
    public init(rootView: Content) {
        self.c = HostingController(rootView: rootView)
    }
    
    public var body: some View {
        RepresentControllerView(uiViewController: c).environmentObject(c)
    }
}

struct ContentView: View {
    struct RootView: View {
        @EnvironmentObject var viewController: HostingController<RootView>
        private let urlString = "https://example.org"
        func present() {
            let safari = SFSafariViewController(url: URL(string: urlString)!)
            viewController.present(safari, animated: true, completion: nil)
        }
        var body: some View {
            Button(urlString, action: present)
        }
    }
    var body: some View {
        HostingControllerView(rootView: RootView())
    }
}

期待通りウェブをフルスクリーンモーダルで表示が出来た。