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struct ContentView2: View {
  var model = Model()
  
  var body: some View {
    NavigationStack {
      List {
        ForEach(model.items.sorted(using: KeyPathComparator(\.createdDate, order: .reverse))) { item in
          Cell(item: item)
        }
      }

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struct Item: Identifiable  {
  var id: UUID = UUID()
  var value: Int
  var createdDate: Date
}

@Observable
class Model {
  var items: [Item] = (0..<100).map { Item(value: $0, createdDate: .now.addingTimeInterval(Double($0 * 60 * 60 * 24))) }
  var itemVisibility: [Item.ID: Bool] = [:]

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@attached(member, names: named(RawValue), named(rawValue), named(`init`), arbitrary)
@attached(extension, conformances: OptionSet)
public macro OptionSet<RawType>() = #externalMacro(module: "SwiftMacros", type: "OptionSetMacro")


@OptionSet<UInt8>
struct Parameters {
  enum Options: UInt8 {
    case p0 = 0
    case p7 = 7

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// https://x.com/usagimaruma/status/1460083928358789123

struct ContenteView: View {
  var text = "プレゼンテーション"
  
  var body: some View {
    VStack {
      Rectangle()
        .fill(Color(.secondarySystemGroupedBackground))
        .frame(width: 300, height: 100)

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struct ContentView: View {
  let urls: [URL] = [
    .init(string: "https://webcg.ismcdn.jp/mwimgs/0/f/640wm/img_0f0ccf94fbdcfab41992550a42460808110746.jpg")!,
    .init(string: "https://upload.wikimedia.org/wikipedia/commons/thumb/8/85/Tour_Eiffel_Wikimedia_Commons_%28cropped%29.jpg/640px-Tour_Eiffel_Wikimedia_Commons_%28cropped%29.jpg")!,
  ]
  
  var body: some View {
    ScrollView {
      LazyVStack(spacing: 40) {
        ForEach(urls, id: \.self) { url in

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// 1. Add Person
// 2. Add Car
// 3. Delete Person(or Car)

import SwiftUI
import SwiftData

@main
struct Xcode17_SampleApp: App {
  var body: some Scene {

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struct ContentView: View {
  @State var selection: Int? = 0
  
  var body: some View {
    NavigationSplitView {
      List(selection: $selection) {
        ForEach(0..<10) { i in
          Text("Data \(i)")
            .tag(i)
        }

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import SwiftUI

enum TabItem: String, CaseIterable, Hashable, Identifiable {
  case first
  case second
  case third
  var id: Self { self }
}

struct ContentView: View {

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// Previewだと動くがシミュレーターだと動かない
// 原因? Environment(\.openURL), NavigationLink

struct ContentView: View {
  let urls: [URL] = [
    URL(string: "https://github.com")!,
    URL(string: "https://github.com")!,
    URL(string: "https://github.com")!,
  ]
  

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struct ContentView: View {
  @State var text = ""
  
  var body: some View {
    NavigationStack {
      List {
        TextField("Text", text: $text)
      }
      //.padding(.top, 10)
      .toolbarBackground(.visible, for: .navigationBar)