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@chriseidhof
Created Mar 28, 2022
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//
// ContentView.swift
// Shared
//
// Created by Chris Eidhof on 28.03.22.
//
import SwiftUI
struct Item: View {
var id: Int
@State private var counter = 0
var body: some View {
VStack {
Text("Item \(id)")
Button("Counter: \(counter)") {
counter += 1
}
}
}
}
struct ItemWrapper: View {
var id: Int
var body: some View {
ZStack {
Item(id: id)
}
}
}
final class MyObject: ObservableObject {
init() { print("Allocating") }
}
struct StateObjectItemTest: View {
@StateObject private var object = MyObject()
let body = Text("Hello")
}
struct StateItemTest: View {
@State var item: Int = {
print("Initing")
return 0
}()
let body = Text("Hello")
}
struct ContentView: View {
var body: some View {
NavigationView {
VStack {
NavigationLink("State Objects") {
List(0..<1000) { id in
StateObjectItemTest()
}
}
NavigationLink("State Values") {
List(0..<1000) { id in
StateItemTest()
}
}
NavigationLink("Indirect State") {
List(0..<1000) { id in
ItemWrapper(id: id)
}
}
NavigationLink("Direct State") {
List(0..<1000) { id in
Item(id: id)
}
}
}
}
}
}
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