Repeated Model Inits w/ State

RepeatedModelInits.swift

import SwiftUI

@Observable class Tester {
  init() { print("INIT:",   ObjectIdentifier(self)) }
  deinit { print("DEINIT:", ObjectIdentifier(self)) }
}

struct ContentView: View {
  
  struct Nested: View {
    
    @State var other     = 42
    @State var tester    = Tester()
           let refresher : Int

    init(refresher: Int) {
      self.refresher = refresher
      print("Nested-init:", refresher, ObjectIdentifier(tester))
    }
    
    var body: some View {
      print("Bested body:", refresher, ObjectIdentifier(tester))
      return VStack {
        Text("Other: \(other)")
        Text(verbatim: "Tester: \(ObjectIdentifier(tester))")
        Text("Refresh: \(refresher)")
        Button("Bump Other") { other += 1 }
      }
    }
  }
  
  @State private var refresher = 0

  var body: some View {
    VStack {
      Nested(refresher: refresher)
      Divider()
      Button("Refresh View") { refresher += 1 }
    }
  }
}

Sample run:

Startup, ee40 object is created:

INIT: ObjectIdentifier(0x000060000023ee40)
Nested-init: 0 ObjectIdentifier(0x000060000023ee40)
Nested body: 0 ObjectIdentifier(0x000060000023ee40)

First click: New object gets created (c120), but the body properly sees ee40. Note that the c120 is not deallocated?

INIT: ObjectIdentifier(0x000060000027c120)
Nested-init: 1 ObjectIdentifier(0x000060000027c120)
Nested body: 1 ObjectIdentifier(0x000060000023ee40)

Second click: New object gets created (d160), body still ee40, the c120 now gets deallocated.

INIT: ObjectIdentifier(0x000060000027d160)
Nested-init: 2 ObjectIdentifier(0x000060000027d160)
DEINIT: ObjectIdentifier(0x000060000027c120)
Nested body: 2 ObjectIdentifier(0x000060000023ee40)

Third click...

INIT: ObjectIdentifier(0x0000600000278980)
Nested-init: 3 ObjectIdentifier(0x0000600000278980)
DEINIT: ObjectIdentifier(0x000060000027d160)
Nested body: 3 ObjectIdentifier(0x000060000023ee40)