Module 2 of 3 in Your First iOS App: An App From Scratch

Your First iOS App: Data Flow in SwiftUI

Jun 25 2026, Swift 6, iOS 26, Xcode 26

This module continues building Bull’s Eye while introducing SwiftUI data concepts. You will add button actions, use state and bindings, work with strings and variables, and move game logic into a model. By Catie Catterwaul.

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EXPERIENCE

Beginner level

EST TIME TO COMPLETE

44 mins

CONTENT

7 lessons

Module outcomes

Add button actions and alerts to a SwiftUI view.
Use state and bindings to keep a SwiftUI interface in sync with data.
Move Bull’s Eye game logic into a model object.

Covered concepts

SwiftUI Button actions and alerts
State and bindings
String interpolation, variables, constants and model structure

Module content

Buttons & Actions Lesson (4 mins)

Let’s review what you’ll be learning in this module and learn how to connect your button to some Swift code that prints a message to the console.

Start

Introduction • Start Video · 1 min

Buttons & Actions Video · 4 mins

SwiftUI State Lesson (10 mins)

Learn about an important concept called SwiftUI state, which helps you keep your user interface and app state always consistent.

Start

SwiftUI State • Start Video · 10 mins

SwiftUI Bindings Lesson (4 mins)

Use SwiftUI bindings to keep the value of the slider synchronized with a state variable.

Start

SwiftUI Bindings • Start Video · 4 mins

Strings Lesson (2 mins)

Learn about a very important data type you’ll use in your iOS apps, which you can use to store a sequence of characters.

Start

Strings • Start Video · 2 mins

Variables Lesson (9 mins)

Learn how to detect when the user moves the slider, and how to store the result in a variable.

Start

Variables • Start Video · 9 mins

Intro to App Architecture Lesson (4 mins)

Learn how you can use some basic concepts of app architecture to make your code more clean and maintainable.

Start

Intro to App Architecture • Start Video · 4 mins

Create a Model Lesson (11 mins)

Create a basic data model for Bull’s Eye, that stores the target, current round and total score. Then review where you are with your programming to-do list.

Start

Create a Model • Start Video · 10 mins

Conclusion Reading · 1 min

Quiz: SwiftUI Data 8 questions

Module outcomes

Covered concepts

Module content

Your First iOS App: Coding in Swift

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