Delegate for SwiftUI View from Hosting View Controller - ios

Question

I add UIHostingViewController to my Storyboard and make class for this.
Load mySwiftUIView in controller init. Everything works good.
But i want to make hosting controller like delegate for mySwiftUIView because I want to handle button pressing in view.
required init?(coder: NSCoder) {
var mySwiftView = MySwiftUIView()
mySwiftView.delegate = self //self used before super.init call
super.init(coder: coder,rootView: mySwiftView)
}
Id doesn't work because I pass view before hosting controller fully init. Swift shows message "self used before super.init call"
If I will use usual UIViewController and put HostingController inside - it is works. But this is not suitable for me because it calls problem with sizes and navigation.
How can I do it with separate UIHostingController. Thanks
Full code
import UIKit
import SwiftUI
protocol MySwiftUIViewDelegate{
func buttonPressed()
}
struct MySwiftUIView: View {
var delegate: MySwiftUIViewDelegate?
var body: some View {
Button(action: {
delegate?.buttonPressed()
}) {
Text("My button")
}
}
}
class MyHostingViewController: UIHostingController<MySwiftUIView>, MySwiftUIViewDelegate {
required init?(coder: NSCoder) {
var mySwiftView = MySwiftUIView()
//mySwiftView.delegate = self //self used before super.init call
super.init(coder: coder,rootView: mySwiftView)
}
override func viewDidLoad() {
super.viewDidLoad()
}
func buttonPressed() {
performSegue(withIdentifier: "GoToOtherScreenSegue", sender: self)
}
}

Answer 1

Since MyHostingViewController knows that its rootView is MySwiftUIView, you could assign the view controller as the delegate afterwards:
required init?(coder: NSCoder) {
var mySwiftView = MySwiftUIView()
super.init(coder: coder, rootView: mySwiftView)
rootView.delegate = self
}

Answer 2

You can wrap delegate into class
import UIKit
import SwiftUI
protocol MySwiftUIViewDelegate{
func buttonPressed()
}
struct MySwiftUIView: View {
let configuration: Configuration
var body: some View {
Button(action: {
configuration.delegate?.buttonPressed()
}) {
Text("My button")
}
}
}
extension MySwiftUIView {
final class Configuration {
unowned var delegate: MySwiftUIViewDelegate?
}
}
class MyHostingViewController: UIHostingController<MySwiftUIView>, MySwiftUIViewDelegate {
required init?(coder: NSCoder) {
let configuration = MySwiftUIView.Configuration()
let mySwiftView = MySwiftUIView(configuration: configuration)
super.init(coder: coder,rootView: mySwiftView)
configuration.delegate = self
}
override func viewDidLoad() {
super.viewDidLoad()
}
func buttonPressed() {
performSegue(withIdentifier: "GoToOtherScreenSegue", sender: self)
}
}