Learn SwiftUI 5 & iOS 17 by Building Complete Goals App

Launch an iOS app in Xcode, select the app template, name it goals app, set a unique bundle identifier, choose SwiftUI with Swift, and begin Firebase configuration and unit tests.

Configure Firebase for your goals app by creating a Firebase project, adding an iOS app, downloading GoogleService-Info.plist, and initializing Firestore via Swift Package Manager and AppDelegate.

Create a folder structure to organize code by adding utils, repositories, view models, views, and models; move the content view to views and apply repository pattern with dependency injection.

Create a codable goal model in the models folder with id, name, due date, color, icon, and items, plus a goals extension with mock data for unit testing.

Explore the repository design pattern in Swift, learning abstraction, encapsulation, decoupling, and testability, then implement an in-memory book repository to manage data via a protocol-driven API.

Define the goals repository protocol to standardize mock and Firebase implementations with async methods. Implement get all goals, add and delete goals, and add or delete items for each goal.

Create a mock goal repository conforming to the goal repository protocol, using in-memory goals for UI previews and unit tests, supporting get all, add, delete, and updating items within goals.

Add a unit testing target for a mock goal repository, enable testable imports, set up and tear down tests, and cover get all, add, delete, and delete item operations.

Set up a Firebase Firestore repository for the goals app, configure Firestore rules, and create a final Swift class FirebaseGoalRepository to manage documents via a Firestore database.

Fetch all goals from the Firebase goal repository by querying the Firestore 'goals' collection, map documents to Codable goals, assign document IDs, and return the results.

Create an add goal function using a do-catch block, handle errors, and return an optional goal after saving to Firebase Firestore, then retrieve the saved document as confirmation.

Implement the delete function for goals in the Firebase repository, centralize the goals string to avoid mistypes, extract the goal id, and return true on success or false on error.

Add new goal items by validating the id with a guard statement, then update the firebase document using array union to avoid duplicates and retrieve the updated goal.

Implement delete goal item by removing a specific element from a Firebase document array using array remove, with fetch and update, then test in the content view.

Explore unit testing a Firebase goal repository with Swift concurrency by creating, adding, fetching, updating, and deleting goals and items, then restoring an empty state.

Extend SwiftUI color with a hex initializer to convert hex strings into color objects and add a helper to convert colors back to hex, with input sanitization.

Explore the two hex function that converts a color object to a hex string by extracting red, green, blue, and alpha from a UI color and formatting hex values.

Learn how to write color extension unit tests in SwiftUI by building a color converter, test color to hex and hex to color conversions with XCTest, negative tests and debugging.

Build a date plus extension in Swift that uses a date formatter with short style and relative date formatting to display yesterday, today, and tomorrow, with unit tests.

Learn how to wrap UIKit views in SwiftUI using the UIViewRepresentable protocol, implementing makeUIView and updateUIView, with an emoji text field and an activity indicator example.

Create an emoji text field in SwiftUI by wrapping a UIKit UI text field with UIViewRepresentable, binding text and placeholder, and using a coordinator to handle delegate events.