hmlongco

struct User {
    var firstName: String
    var lastName: String
    var email: String
    var phoneNumber: String
    var street: String
    var city: String
    var state: String
    var zipCode: String
}

hmlongco

class InterruptedTaskViewModel: ObservableObject {
    @Published var name = "Michael"
    init() {
        print("INIT")
    }
    @MainActor
    func load() {
        Task {
            print("LOADING")
            let _ = try? await Task.sleep(nanoseconds: 3 * NSEC_PER_SEC)

hmlongco

struct ChildStateDemo: View {
    @State var account = 1
    var body: some View {
        VStack(spacing: 20) {
            SubView(id: account)
                .id(account) // required to change subview state
          
            Button("Account 1") {
                account = 1
            }

hmlongco

struct ParentView: View {
    @State var id = UUID().uuidString
    var body: some View {
        VStack(spacing: 20) {
            VStack {
                Text("Parent View")
                Text(id).font(.footnote)
            }
            ChildView(name: "Child Maintains State On Update")
            ChildView(name: "Child Loses State On Update")

hmlongco

import SwiftUI

class ContentModel: ObservableObject {
    @Published var count: Int = 0
    let items10 = (0 ..< 10).map { Item(id: $0 + 1) }
    let items100 = (0 ..< 100).map { Item(id: $0 + 1) }
    let items10K = (0 ..< 10_000).map { Item(id: $0 + 1) }
    let items100K = (0 ..< 100_000).map { Item(id: $0 + 1) }
}

hmlongco

// Classic 

class ShopViewModel: ObservableObject {
    @Published private(set) var products: [Products]
    init(products: [Products] = []) {
        self.products = products
    }
    public func add(product) {
        products.append(product)
    }

hmlongco

    
class DeinitTracker {}

class Test {
    init() {}
    
    #if DEBUG
    lazy var deinitTracker: DeinitTracker? = DeinitTracker()
    #endif
}

hmlongco

extension Binding {
    public func defaultValue<T>(_ value: T) -> Binding<T> where Value == Optional<T> {
        Binding<T> {
            wrappedValue ?? value
        } set: {
            wrappedValue = $0
        }
    }
}

hmlongco

extension Binding {
    public static func variable(_ value: Value) -> Binding<Value> {
        var state = value
        return Binding<Value> {
            state
        } set: {
            state = $0
        }
    }
}