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Learn Swiftui - 9 Code Examples & CST Typing Practice Test

SwiftUI is Apple’s declarative framework for building user interfaces across iOS, macOS, watchOS, and tvOS using Swift. It allows developers to create fully native apps with less code and real-time previews.

View all 9 Swiftui code examples →
SwiftUI Simple Todo AppSwiftUI Counter AppSwiftUI Step CounterSwiftUI Dark Mode CounterSwiftUI Multi CounterSwiftUI Auto Increment CounterSwiftUI Todo With PrioritySwiftUI Countdown TimerSwiftUI Counter With Alert

Learn SWIFTUI with Real Code Examples

Updated Nov 23, 2025

Explain

SwiftUI enables building native Apple apps using a declarative syntax.

It integrates seamlessly with Swift and Apple’s ecosystem, providing live previews in Xcode.

Ideal for developers focusing on iOS/macOS apps who want fast, maintainable, and modern UI development.

Core Features

Swift-based declarative UI components

State-driven rendering with @State, @Binding, @ObservedObject

Integration with Combine for reactive programming

Support for Dark Mode, localization, accessibility

Previews and canvas in Xcode for real-time feedback

Basic Concepts Overview

Views are Swift structs conforming to `View` protocol

Use @State, @Binding, @ObservedObject for reactive state

Modifiers change view properties (e.g., `.padding()`, `.background()`)

Combine used for asynchronous/reactive updates

Previews provide real-time feedback in Xcode canvas

Project Structure

App/ - main entry point and app lifecycle

Views/ - reusable SwiftUI view components

Models/ - data models

Assets/ - images, colors, fonts

Supporting files - Info.plist, AppDelegate, SceneDelegate

Building Workflow

Create SwiftUI project in Xcode

Define Views and layout using declarative syntax

Manage state with property wrappers

Test UI with Xcode previews and simulators

Run app on device and optimize performance

Difficulty Use Cases

Beginner: simple forms and static views

Intermediate: dynamic data-driven UI using @State and @ObservedObject

Advanced: integrating Combine and animations

Expert: bridging SwiftUI with UIKit/AppKit

Community: contributing SwiftUI packages and components

Comparisons

SwiftUI vs UIKit: declarative vs imperative UI building

SwiftUI vs React Native: native Apple-only vs cross-platform JS

SwiftUI offers seamless integration with Apple ecosystem

UIKit may still be needed for complex legacy components

SwiftUI emphasizes speed, maintainability, and live previews

Versioning Timeline

2019 - SwiftUI introduced at WWDC

2020 - SwiftUI 2.0 added improved controls, widgets, and Lazy stacks

2021 - SwiftUI 3.0 expanded macOS and iPadOS support

2022-2023 - SwiftUI performance and API enhancements

2024-2025 - Ongoing updates with latest iOS/macOS features

Glossary

View: a SwiftUI UI element conforming to View protocol

Modifier: methods that change view properties

@State/@Binding: property wrappers for state management

Combine: reactive framework for data streams

Preview: live rendering of SwiftUI view in Xcode

Installation Setup

Install Xcode from the Mac App Store

Ensure Swift toolchain is up to date

Create SwiftUI project in Xcode: File -> New -> Project -> App -> SwiftUI

Select target platforms (iOS, macOS, etc.)

Run app on simulator or physical device

Environment Setup

Install latest Xcode from Mac App Store

Enable developer mode on Mac

Configure Apple Developer account

Create SwiftUI project in Xcode

Run app on simulator or physical device

Config Files

Info.plist - app metadata and permissions

Assets.xcassets - images, colors, and fonts

App.swift - main entry point and lifecycle

ContentView.swift - main SwiftUI view

Supporting files - LaunchScreen.storyboard, entitlements

Cli Commands

xcodebuild build -scheme MyApp

xcodebuild test -scheme MyApp

swift build

xcodebuild archive

xcodebuild -exportArchive for distribution

Internationalization

Use NSLocalizedString for localization

SwiftUI Text adapts to locale automatically

Supports LTR and RTL languages

Format dates/numbers with DateFormatter/NumberFormatter

Localize images and assets as needed

Accessibility

Use .accessibility modifiers for VoiceOver

Support Dynamic Type and contrast

Test with Accessibility Inspector

Keyboard navigation supported on macOS

Encourage semantic labeling of UI elements

Ui Styling

Use modifiers for styling (padding, background, font)

Adaptive layouts with VStack/HStack/ZStack

Dark Mode support with system colors

Custom components as SwiftUI Views

Animations and transitions built-in

State Management

Use @State for local view state

@Binding for parent-child state propagation

@ObservedObject / @StateObject for shared state

Combine publishers for reactive data

EnvironmentObject for global app state

Data Management

Local storage with UserDefaults or CoreData

Remote data with URLSession or Combine publishers

JSON encoding/decoding using Codable

Integration with CloudKit or third-party APIs

Reactive updates with Combine pipelines

Architecture

Declarative UI: UI reflects app state automatically

State-driven architecture with property wrappers

Integration with Swift Combine for reactive updates

Composes views via Swift structs

Event-driven with bindings and observable objects

Rendering Model

SwiftUI maps state to native views

Views automatically re-render on state changes

Modifiers adjust layout, style, and behavior

Event-driven UI with gestures and actions

Bridges to UIKit/AppKit for legacy or complex components

Architectural Patterns

Declarative and reactive UI architecture

State-driven view rendering

Composable views for modular UI

Integration with Combine for asynchronous data flow

Separation of model, view, and view-model patterns encouraged

Real World Architectures

iOS banking or finance apps

macOS productivity tools

WatchOS fitness apps

tvOS streaming applications

Data-driven consumer apps with reactive UI

Design Principles

Declarative UI driven by app state

Reactive data binding using property wrappers

Cross-Apple-platform support with single codebase

Integration with Combine and Swift ecosystem

Live previews for rapid development

Scalability Guide

Modularize views for large apps

Use lazy stacks and lists

Optimize image and asset usage

Leverage Combine for async data handling

Test across device types and screen sizes

Migration Guide

Update Xcode and Swift version

Replace deprecated APIs and modifiers

Use new SwiftUI components in place of UIKit where possible

Test on latest OS versions

Refactor state management for new SwiftUI features

Performance Notes

Leverage SwiftUI’s diffing for UI updates

Avoid heavy computations inside view body

Use LazyVStack/LazyHStack for large lists

Minimize nesting to reduce layout cost

Test on real devices for performance profiling

Security Notes

Validate and sanitize all user input

Follow Apple’s secure coding guidelines

Use Keychain for sensitive data

Use HTTPS for network communications

Keep Swift/Xcode updated for latest security fixes

Monitoring Analytics

Use Apple Analytics and Firebase

Monitor crashes with Crashlytics

Profile performance with Instruments

Track user behavior with built-in metrics

Audit app for battery and memory usage

Code Quality

Follow Swift and SwiftUI best practices

Document views and modifiers

Unit test state and logic

Profile UI performance with Instruments

Ensure accessibility and localization

Practical Examples

iOS task manager app

macOS file manager utility

watchOS fitness tracking app

tvOS streaming app UI

Prototype interactive app with SwiftUI previews

Troubleshooting

Check Swift version compatibility

Ensure @State/@Binding used correctly

Verify previews run in correct target device

Resolve layout issues with modifiers and stacks

Debug runtime crashes in Xcode console

Testing Guide

Unit tests for Swift code using XCTest

UI tests for SwiftUI views

Preview canvas for quick layout validation

Test on multiple simulators and devices

Use Instruments to monitor performance and memory

Deployment Options

Archive and distribute via Xcode

Deploy to App Store, TestFlight for beta testing

Apply code signing and provisioning profiles

Continuous integration using Xcode Cloud or GitHub Actions

Test on real devices for final validation

Tools Ecosystem

Xcode IDE and previews

Swift language and Combine framework

Swift Package Manager for dependencies

Simulator for iOS, watchOS, tvOS, macOS

Debugging and profiling tools in Xcode

Integrations

Combine for reactive data flow

CoreData, CloudKit, and local storage

UIKit/AppKit for legacy components

Swift Packages for third-party libraries

Analytics and push notifications via Apple frameworks

Productivity Tips

Leverage Xcode previews for rapid iteration

Use reusable SwiftUI views and modifiers

Apply Combine for asynchronous tasks

Test on multiple devices frequently

Document state management and view hierarchy

Challenges

Build a SwiftUI to-do list app

Integrate network data with Combine

Animate a custom component

Create a cross-platform Apple app (iOS + macOS)

Deploy to TestFlight and App Store

Learning Path

Learn Swift language basics

Understand SwiftUI declarative syntax

Explore property wrappers and state management

Build small projects and use Xcode previews

Deploy apps to iOS/macOS devices

Skill Improvement Plan

Week 1: Learn Swift and create basic SwiftUI views

Week 2: Use @State, @Binding, @ObservedObject for dynamic UI

Week 3: Add animations and gestures

Week 4: Integrate Combine and networking

Week 5: Optimize, test, and deploy app to device

Interview Questions

Explain SwiftUI’s declarative approach vs UIKit.

What are @State, @Binding, and @ObservedObject?

How does SwiftUI integrate with Combine?

Describe the SwiftUI project structure.

How to debug SwiftUI layout and runtime issues?

Cheat Sheet

`@State var name: String` - reactive state variable

`Text(name)` - display reactive value

`VStack { ... }` - vertical layout container

`List(data) { item in ... }` - dynamic list

`.animation(.default)` - add animation to view

Books

SwiftUI Essentials

Mastering SwiftUI

SwiftUI by Tutorials

SwiftUI Cookbook

iOS Development with SwiftUI

Tutorials

Apple SwiftUI tutorials

YouTube SwiftUI tutorials

Swift by Sundell blog and examples

SwiftUI projects on GitHub

Code samples in Xcode playgrounds

Official Docs

https://developer.apple.com/xcode/swiftui/

https://developer.apple.com/documentation/swiftui/

https://developer.apple.com/tutorials/swiftui

Community Links

Apple Developer Forums

Swift Forums

StackOverflow SwiftUI tag

Reddit r/SwiftUI

Twitter #SwiftUI

Community Support

Apple Developer Forums

Swift Forums

StackOverflow SwiftUI tag

Reddit r/SwiftUI

GitHub SwiftUI projects and packages

Monetization

Consumer apps via App Store

In-app purchases and subscriptions

Enterprise apps for iOS/macOS

Consulting for SwiftUI development

Rapid prototyping and deployment for startups

Future Roadmap

Expanded API and control support

Better backward compatibility

Performance improvements across Apple platforms

Integration with new Apple hardware features

Community-driven sample apps and packages

When Not To Use

Apps targeting Android or cross-platform

Complex UI requiring extensive UIKit components

Teams not familiar with Swift

Projects requiring iOS < 13 support

Highly customized animations not yet supported in SwiftUI

Final Summary

SwiftUI is Apple’s modern declarative UI framework for native apps.

Supports iOS, macOS, watchOS, and tvOS from a single Swift codebase.

Integrates seamlessly with Swift, Combine, and Apple ecosystem.

Enables fast, maintainable, and visually dynamic apps.

Focuses on reactive state-driven UI and live development previews.

Faq

Is SwiftUI maintained?

Yes, by Apple and continuously updated with Xcode.

Can I use SwiftUI for macOS apps?

Yes, it supports iOS, macOS, watchOS, and tvOS.

Does it support animations?

Yes, built-in declarative animations and gestures.

Can I mix SwiftUI and UIKit?

Yes, use UIHostingController and UIViewRepresentable.

Is SwiftUI suitable for production apps?

Yes, widely used in modern Apple apps.

Code Sample Descriptions

1

SwiftUI Simple Todo App

import SwiftUI

struct ContentView: View {
    @State private var todos: [String] = []
    @State private var newTodo: String = ""

    var body: some View {
        NavigationView {
        VStack {
        HStack {
        TextField("New Todo", text: $newTodo)
        .textFieldStyle(RoundedBorderTextFieldStyle())
        Button("Add") {
        if !newTodo.isEmpty {
        todos.append(newTodo)
        newTodo = ""
        }
        }
        }.padding()
        List(todos, id: \ .self) { todo in
        Text(todo)
        }
        }
        .navigationTitle("Todo App")
        }
    }
}

@main
struct TodoApp: App {
    var body: some Scene {
        WindowGroup {
        ContentView()
        }
    }
}

Demonstrates a simple SwiftUI app with a Todo list, adding tasks, and displaying them using SwiftUI List and State management.

Let’s Try →
2

SwiftUI Counter App

import SwiftUI

struct CounterView: View {
    @State private var count: Int = 0

    var body: some View {
        VStack(spacing: 20) {
        Text("Counter: \(count)")
        .font(.largeTitle)
        HStack {
        Button("+") { count += 1 }
        Button("-") { count -= 1 }
        Button("Reset") { count = 0 }
        }
        }.padding()
    }
}

@main
struct CounterApp: App {
    var body: some Scene {
        WindowGroup {
        CounterView()
        }
    }
}

A simple counter app with increment, decrement, and reset buttons.

Let’s Try →
3

SwiftUI Step Counter

import SwiftUI

struct StepCounterView: View {
    @State private var count: Int = 0
    @State private var step: String = "1"

    var body: some View {
        VStack(spacing: 20) {
        Text("Counter: \(count)")
        HStack {
        TextField("Step", text: $step)
        .keyboardType(.numberPad)
        .textFieldStyle(RoundedBorderTextFieldStyle())
        }
        HStack {
        Button("+") { count += Int(step) ?? 1 }
        Button("-") { count -= Int(step) ?? 1 }
        Button("Reset") { count = 0 }
        }
        }.padding()
    }
}

@main
struct StepCounterApp: App {
    var body: some Scene {
        WindowGroup {
        StepCounterView()
        }
    }
}

Counter app with customizable step increment.

Let’s Try →
4

SwiftUI Dark Mode Counter

import SwiftUI

struct DarkModeCounterView: View {
    @State private var count: Int = 0
    @Environment(\.colorScheme) var colorScheme
    @State private var isDark: Bool = false

    var body: some View {
        VStack(spacing: 20) {
        Text("Counter: \(count)")
        .font(.largeTitle)
        HStack {
        Button("+") { count += 1 }
        Button("-") { count -= 1 }
        Button("Reset") { count = 0 }
        }
        Button("Toggle Theme") { isDark.toggle() }
        }.padding()
        .preferredColorScheme(isDark ? .dark : .light)
    }
}

@main
struct DarkCounterApp: App {
    var body: some Scene {
        WindowGroup {
        DarkModeCounterView()
        }
    }
}

Counter app with light/dark theme toggle.

Let’s Try →
5

SwiftUI Multi Counter

import SwiftUI

struct MultiCounterView: View {
    @State private var counters: [Int] = [0,0,0]

    var body: some View {
        VStack(spacing: 20) {
        ForEach(counters.indices, id: \.self) { i in
        VStack {
        Text("Counter \(i+1): \(counters[i])")
        HStack {
        Button("+") { counters[i] += 1 }
        Button("-") { counters[i] -= 1 }
        }
        }
        }
        }.padding()
    }
}

@main
struct MultiCounterApp: App {
    var body: some Scene {
        WindowGroup {
        MultiCounterView()
        }
    }
}

Multiple independent counters in a single view.

Let’s Try →
6

SwiftUI Auto Increment Counter

import SwiftUI

struct AutoCounterView: View {
    @State private var count: Int = 0
    @State private var isRunning: Bool = true

    var body: some View {
        VStack(spacing: 20) {
        Text("Counter: \(count)")
        .font(.largeTitle)
        HStack {
        Button(isRunning ? "Pause" : "Resume") { isRunning.toggle() }
        Button("Reset") { count = 0 }
        }
        }.padding()
        .onAppear {
        Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { _ in
        if isRunning { count += 1 }
        }
        }
    }
}

@main
struct AutoCounterApp: App {
    var body: some Scene {
        WindowGroup {
        AutoCounterView()
        }
    }
}

Counter that automatically increments every second.

Let’s Try →
7

SwiftUI Todo With Priority

import SwiftUI

struct PriorityTodoView: View {
    @State private var todos: [(task:String, priority:String)] = []
    @State private var newTask: String = ""
    @State private var priority: String = ""

    var body: some View {
        VStack(spacing: 20) {
        HStack {
        TextField("Task", text: $newTask)
        TextField("Priority", text: $priority)
        Button("Add") {
        if !newTask.isEmpty {
        todos.append((newTask, priority))
        newTask = ""; priority = ""
        }
        }
        }.padding()
        List(todos, id: \ .task) { todo in
        Text("\(todo.task) (Priority: \(todo.priority))")
        }
        }
    }
}

@main
struct PriorityTodoApp: App {
    var body: some Scene {
        WindowGroup {
        PriorityTodoView()
        }
    }
}

Todo app where each task has a priority and displays it.

Let’s Try →
8

SwiftUI Countdown Timer

import SwiftUI

struct CountdownView: View {
    @State private var count: Int = 10

    var body: some View {
        VStack(spacing: 20) {
        Text("Time: \(count)")
        .font(.largeTitle)
        HStack {
        Button("Start") {
        Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { timer in
        if count > 0 { count -= 1 } else { timer.invalidate() }
        }
        }
        Button("Reset") { count = 10 }
        }
        }.padding()
    }
}

@main
struct CountdownApp: App {
    var body: some Scene {
        WindowGroup {
        CountdownView()
        }
    }
}

Countdown timer starting from 10 seconds.

Let’s Try →
9

SwiftUI Counter With Alert

import SwiftUI

struct AlertCounterView: View {
    @State private var count: Int = 0
    @State private var showAlert: Bool = false

    var body: some View {
        VStack(spacing: 20) {
        Text("Counter: \(count)")
        .font(.largeTitle)
        HStack {
        Button("+") {
        count += 1
        if count == 10 { showAlert = true }
        }
        Button("Reset") { count = 0 }
        }
        }.alert(isPresented: $showAlert) {
        Alert(title: Text("Alert"), message: Text("Count reached 10!"), dismissButton: .default(Text("OK")))
        }.padding()
    }
}

@main
struct AlertCounterApp: App {
    var body: some Scene {
        WindowGroup {
        AlertCounterView()
        }
    }
}

Counter shows an alert when it reaches 10.

Let’s Try →

Frequently Asked Questions about Swiftui

What is Swiftui?

SwiftUI is Apple’s declarative framework for building user interfaces across iOS, macOS, watchOS, and tvOS using Swift. It allows developers to create fully native apps with less code and real-time previews.

What are the primary use cases for Swiftui?

Native iOS apps with modern UI. macOS desktop apps. watchOS and tvOS apps. Rapid prototyping for Apple platforms. Apps leveraging Swift ecosystem and Apple frameworks

What are the strengths of Swiftui?

Fully native performance. Single codebase across Apple platforms. Minimal boilerplate code with declarative approach. Tight integration with Swift and Apple frameworks. Live preview and hot reload speeds up development

What are the limitations of Swiftui?

Apple platforms only, not cross-platform outside Apple. Requires Swift knowledge. Some complex UI components require UIKit fallback. Limited backward compatibility (iOS 13+). Smaller ecosystem compared to UIKit/React Native for some features

How can I practice Swiftui typing speed?

CodeSpeedTest offers 9+ real Swiftui code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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