statetest.swift

import SwiftUI

struct MyNumber: View {
    private let value: Int

    init() {
        print(#function, #line)
        value = 1000
    }

    init(_ v: Int) {
        print(#function, #line)
        value = v
    }

    var body: some View {
        Text("\(value)")
    }
}

struct ContentView : View {
    @State var something: Int = 0

    var body: some View {
        return VStack {
            if Bool.random() {
                MyNumber()
            } else {
                MyNumber(something)
            }
            Button(action: {
                self.something = Int.random(in: 0...100)
            }) {
                Text("Push")
            }
        }
    }
}