Module 2 of 2 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
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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
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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

1
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
2
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
3
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
4
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
5
Variables Lesson (9 mins)

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

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Variables • Start Video · 9 mins
6
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.

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Intro to App Architecture • Start Video · 4 mins
7
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