Book Image

Mastering iOS 14 Programming - Fourth Edition

By : Mario Eguiluz Alebicto, Chris Barker, Donny Wals
Book Image

Mastering iOS 14 Programming - Fourth Edition

By: Mario Eguiluz Alebicto, Chris Barker, Donny Wals

Overview of this book

Mastering iOS 14 development isn’t a straightforward task, but this book can help you do just that. With the help of Swift 5.3, you’ll not only learn how to program for iOS 14 but also be able to write efficient, readable, and maintainable Swift code that reflects industry best practices. This updated fourth edition of the iOS 14 book will help you to build apps and get to grips with real-world app development flow. You’ll find detailed background information and practical examples that will help you get hands-on with using iOS 14's new features. The book also contains examples that highlight the language changes in Swift 5.3. As you advance through the chapters, you'll see how to apply Dark Mode to your app, understand lists and tables, and use animations effectively. You’ll then create your code using generics, protocols, and extensions and focus on using Core Data, before progressing to perform network calls and update your storage and UI with the help of sample projects. Toward the end, you'll make your apps smarter using machine learning, streamline the flow of your code with the Combine framework, and amaze users by using Vision framework and ARKit 4.0 features. By the end of this iOS development book, you’ll be able to build apps that harness advanced techniques and make the best use of iOS 14’s features.
Table of Contents (22 chapters)

Exploring UITableView further

In this section, we'll touch on some extra little bits that will allow you to make the most out of UITableView. We'll also cover in more detail some areas previously explored, such as the reuse identifier.

Further understanding reuse identifiers

Earlier in this chapter, you learned about cell-reuse in table views. We assigned a reuse identifier to a table view cell so that the table view would know which cell it should use to display contacts in. Cell-reuse is a concept that is applied to a table view so that it can reuse cells that it has already created.

This means that the only cells that are in memory are either on the screen or barely off the screen. The alternative would be to keep all cells in memory, which could potentially mean that hundreds of thousands of cells are held in memory at any given time.

For a visualization of what cell reuse looks like, have a look at the following diagram:

Figure...