@State and visibility toggle

StateToggle.swift

import SwiftUI

struct CounterView: View {
  @State var count = 0
  
  var body: some View {
    Text(String(count))
    Button("+ 1", action: { count = count + 1 })
  }
}


struct ContentView: View {
  @State var visible = true
  
  var body: some View {
    VStack {
      if (visible) {
        CounterView()
      }
      
      Spacer()
      
      Button("Toggle", action: { visible.toggle() })
    }.font(.system(size: 26))
  }
}