Apple Hig Designer

// ✅ Clear, focused content
Text("Welcome back, Sarah")
    .font(.title)
    .foregroundColor(.primary)

// ❌ Unclear, cluttered
Text("Welcome back, Sarah!!!")
    .font(.title)
    .foregroundColor(.red)
    .background(.yellow)
    .overlay(Image(systemName: "star.fill"))

// ✅ Content-focused
VStack(alignment: .leading, spacing: 8) {
    Text("Article Title")
        .font(.headline)
    Text("Article content goes here...")
        .font(.body)
        .foregroundColor(.secondary)
}
.padding()

// ❌ Distracting UI
VStack(spacing: 8) {
    Text("Article Title")
        .font(.headline)
        .foregroundColor(.white)
        .background(.blue)
        .border(.red, width: 3)
}

// ✅ Clear depth hierarchy
ZStack {
    Color(.systemBackground)

    VStack {
        // Card with elevation
        CardView()
            .shadow(radius: 8)
    }
}

// Using blur for depth
Text("Content")
    .background(.ultraThinMaterial)

NavigationStack {
    List {
        Text("Item 1")
        Text("Item 2")
    }
    .navigationTitle("Title")
    .navigationBarTitleDisplayMode(.large)
    .toolbar {
        ToolbarItem(placement: .navigationBarTrailing) {
            Button("Add") {
                // Action
            }
        }
    }
}

TabView {
    HomeView()
        .tabItem {
            Label("Home", systemImage: "house")
        }

    SearchView()
        .tabItem {
            Label("Search", systemImage: "magnifyingglass")
        }

    ProfileView()
        .tabItem {
            Label("Profile", systemImage: "person")
        }
}

List {
    Section("Today") {
        ForEach(items) { item in
            NavigationLink {
                DetailView(item: item)
            } label: {
                HStack {
                    Image(systemName: item.icon)
                        .foregroundColor(.accentColor)
                    Text(item.title)
                }
            }
        }
    }
}
.listStyle(.insetGrouped)

struct ContentView: View {
    @State private var showSheet = false

    var body: some View {
        Button("Show Details") {
            showSheet = true
        }
        .sheet(isPresented: $showSheet) {
            DetailView()
                .presentationDetents([.medium, .large])
        }
    }
}

// Filled button (primary action)
Button("Continue") {
    // Action
}
.buttonStyle(.borderedProminent)

// Bordered button (secondary action)
Button("Cancel") {
    // Action
}
.buttonStyle(.bordered)

// Plain button (tertiary action)
Button("Learn More") {
    // Action
}
.buttonStyle(.plain)

@State private var username = ""
@State private var password = ""

VStack(alignment: .leading, spacing: 16) {
    // Standard text field
    TextField("Username", text: $username)
        .textFieldStyle(.roundedBorder)
        .textContentType(.username)
        .textInputAutocapitalization(.never)
        .autocorrectionDisabled()

    // Secure field
    SecureField("Password", text: $password)
        .textFieldStyle(.roundedBorder)
        .textContentType(.password)
}

@State private var isEnabled = false

Toggle("Enable notifications", isOn: $isEnabled)
    .toggleStyle(.switch)

@State private var selectedSize = "Medium"
let sizes = ["Small", "Medium", "Large"]

// Menu style
Picker("Size", selection: $selectedSize) {
    ForEach(sizes, id: \.self) { size in
        Text(size).tag(size)
    }
}
.pickerStyle(.menu)

// Segmented style (for 2-5 options)
Picker("Size", selection: $selectedSize) {
    ForEach(sizes, id: \.self) { size in
        Text(size).tag(size)
    }
}
.pickerStyle(.segmented)

struct CardView: View {
    var body: some View {
        VStack(alignment: .leading, spacing: 12) {
            Text("Title")
                .font(.headline)

            Text("Description goes here with some details about the content.")
                .font(.subheadline)
                .foregroundColor(.secondary)
                .lineLimit(2)

            Spacer()

            Button("Action") {
                // Action
            }
            .buttonStyle(.borderedProminent)
        }
        .padding()
        .frame(width: 300, height: 200)
        .background(Color(.systemBackground))
        .cornerRadius(12)
        .shadow(color: .black.opacity(0.1), radius: 8, x: 0, y: 4)
    }
}

// Dynamic Type text styles
Text("Large Title").font(.largeTitle)      // 34pt
Text("Title").font(.title)                 // 28pt
Text("Title 2").font(.title2)              // 22pt
Text("Title 3").font(.title3)              // 20pt
Text("Headline").font(.headline)           // 17pt semibold
Text("Body").font(.body)                   // 17pt regular
Text("Callout").font(.callout)             // 16pt
Text("Subheadline").font(.subheadline)     // 15pt
Text("Footnote").font(.footnote)           // 13pt
Text("Caption").font(.caption)             // 12pt
Text("Caption 2").font(.caption2)          // 11pt

// Custom font that scales with Dynamic Type
Text("Custom Text")
    .font(.custom("YourFont-Regular", size: 17, relativeTo: .body))

Text("Light").fontWeight(.light)
Text("Regular").fontWeight(.regular)
Text("Medium").fontWeight(.medium)
Text("Semibold").fontWeight(.semibold)
Text("Bold").fontWeight(.bold)
Text("Heavy").fontWeight(.heavy)

// UI Element Colors
Color(.label)                    // Primary text
Color(.secondaryLabel)           // Secondary text
Color(.tertiaryLabel)            // Tertiary text
Color(.quaternaryLabel)          // Watermark text

Color(.systemBackground)         // Primary background
Color(.secondarySystemBackground) // Secondary background
Color(.tertiarySystemBackground)  // Tertiary background

Color(.systemFill)               // Fill colors
Color(.secondarySystemFill)
Color(.tertiarySystemFill)
Color(.quaternarySystemFill)

Color(.separator)                // Separator lines
Color(.opaqueSeparator)          // Non-transparent separator

// Standard system colors (adapt to dark mode)
Color(.systemRed)
Color(.systemOrange)
Color(.systemYellow)
Color(.systemGreen)
Color(.systemMint)
Color(.systemTeal)
Color(.systemCyan)
Color(.systemBlue)
Color(.systemIndigo)
Color(.systemPurple)
Color(.systemPink)
Color(.systemBrown)
Color(.systemGray)

// Define adaptive color
extension Color {
    static let customBackground = Color("CustomBackground")
}

// In Assets.xcassets, create color set with:
// - Any Appearance: #FFFFFF
// - Dark Appearance: #000000