The simplest way possible to make an async call using SwiftUI, using the ChuckNorris ICNDB API as an example

ContentView.swift

import Foundation
import SwiftUI
struct ContentView: View {
    @State private var joke: String = ""
    var body: some View {
        Text(joke)
        Button {
            Task {
                let (data, _) = try await URLSession.shared.data(from: URL(string:"https://api.chucknorris.io/jokes/random")!)
                let decodedResponse = try? JSONDecoder().decode(Joke.self, from: data)
                joke = decodedResponse?.value ?? ""
            }
        } label: {
            Text("Fetch Joke")
        }
    }
}

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

struct Joke: Codable {
    let value: String
}