Book Image

Learn Swift by Building Applications

By : Emil Atanasov, Giordano Scalzo, Emil Atanasov
Book Image

Learn Swift by Building Applications

By: Emil Atanasov, Giordano Scalzo, Emil Atanasov

Overview of this book

Swift Language is now more powerful than ever; it has introduced new ways to solve old problems and has gone on to become one of the fastest growing popular languages. It is now a de-facto choice for iOS developers and it powers most of the newly released and popular apps. This practical guide will help you to begin your journey with Swift programming through learning how to build iOS apps. You will learn all about basic variables, if clauses, functions, loops, and other core concepts; then structures, classes, and inheritance will be discussed. Next, you’ll dive into developing a weather app that consumes data from the internet and presents information to the user. The final project is more complex, involving creating an Instagram like app that integrates different external libraries. The app also uses CocoaPods as its package dependency manager, to give you a cutting-edge tool to add to your skillset. By the end of the book, you will have learned how to model real-world apps in Swift.
Table of Contents (14 chapters)
Adding Interactivity to Your First App

Favorites screen

The favorites screen should present the all favorite posts. The home screen provides a favorites icon, but we haven't attached any functionality. This means that there are no favorite posts stored on Firebase. We will develop the favorites screen to render a list of all of the user's favorite posts. If the list of posts is empty, then the app will show a prompt to the user (not an empty screen) to suggest there are no favorite posts:

The UI has a collection view that can render all posts, similar to the one on the search screen. The more interesting part is the regular view, which contains a UIImageView and a UILable position in the middle. This view should be visible only when the collection is empty, to inform the user of the app.

The FavoritesViewController class is shown in the following code:

class FavoritesViewController: UIViewController {