SwiftUI delegate sample

ContentView.swift

import SwiftUI

struct ContentView: View, MyProtocol {
    @State var text: String = "My Text"
    var body: some View {
        NavigationView {
            VStack {
                Text(text)
                NavigationLink(destination: SecondView(delegate: self)) {
                    Text("2nd View")
                }
            }
        }
    }
    
    func myFunc() {
        text = "Changed Text"
    }
}

protocol MyProtocol {
    func myFunc()
}

struct SecondView: View {
    var delegate: MyProtocol
    var body: some View {
        Button(action: {
            self.delegate.myFunc()
        }) {
            Text("ChangeText")
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

Your Struct is non class type which cannot conform to a protocol , this will give you a compile time error
ContentView cannot conform to protocol

@nileshteji
Hi.
Thank you for your comment.
In my environment, working well.
Please tell me your environment.
Thank you.

swift --version

swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0

Xcode Version 15.3 (15E204a)

iPhone Simulator Version is 17.4