Using functions from delegate in SwiftUIView - ios

Question

Quick question for anyone feeling up for helping a noob.
So I have a protocol in my main class that has a function that I'd like to access from a UIView. This works for other view controllers. However, in my prepare function, I try this:
if let destination = segue.destination as? SwiftUIView {
destination.delegate = self
}
But I get, "Cast from 'UIViewController' to unrelated type 'SwiftUIView' always fails"
and "Cannot assign to property: 'destination' is a 'let' constant".
This is my whole prepare function:
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.destination is ClientView
{
let vc = segue.destination as? ClientView
vc?.username = thetitle;
}
if let destination = segue.destination as? CreateClientView {
destination.delegate = self
}
if let destination = segue.destination as? SwiftUIView {
destination.delegate = self
}
}
and it works in the CreateClientView. But not for my SwiftUIView. Any idea how to fix this? I am accessing the function in SwiftUIView the same way I do in CreateClientView. Thanks everybody.
SwiftUIView is just type View and looks like this (abridged):
struct SwiftUIView: View {
#State var username: String = ""
#State var address: String = "";
#State var notificationsEnabled: Bool = false
#State var note: String = "";
var delegate:ClientDelegate?;
and SwiftUIView is a child of another view which looks like this:
class CreateClientView: UIViewController {
let contentView = UIHostingController(rootView: SwiftUIView());
var delegate:ClientDelegate?;
var mainView : ViewController?;
override func viewDidLoad() {
super.viewDidLoad()
addChild(contentView);
view.addSubview(contentView.view);
setupConstraints()
// Do any additional setup after loading the view.
}

Answer 1

As the error message states, you're trying to cast a SwiftUI view into a ViewController. which you cant.
For a quick fix to your problem you can try this
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.destination is ClientView
{
let vc = segue.destination as? ClientView
vc?.username = thetitle;
}
if let destination = segue.destination as? CreateClientView {
destination.delegate = self
}
if let destination = segue.destination as? CreateClientView {
destination.delegate = self
}
}
class CreateClientView: UIViewController, SwiftUIViewDelegate {
let contentView = UIHostingController(rootView: SwiftUIView(delegate: self));
var delegate:ClientDelegate?;
var mainView : ViewController?;
override func viewDidLoad() {
super.viewDidLoad()
addChild(contentView);
view.addSubview(contentView.view);
setupConstraints()
// Do any additional setup after loading the view.
}
// MARK: SwiftUIViewDelegate
// call ClientDelegate here whereever SwiftUIViewDelegate methods are implemeted
}
protocol SwiftUIViewDelegate {...}
struct SwiftUIView {
let delegate: SwiftUIViewDelegate
}