Book Image

The Ultimate iOS Interview Playbook

By : Avi Tsadok
Book Image

The Ultimate iOS Interview Playbook

By: Avi Tsadok

Overview of this book

As an iOS developer, you must possess a diverse skill set encompassing Swift coding, design knowledge, and mastery of development tools. And while the demand for iOS developers remains high, the competition for landing your dream job has intensified in recent years. Being a skilled iOS developer is no longer enough — acing interviews is now just as essential as having technical expertise. In The Ultimate iOS Interview Playbook, you'll discover innovative ways to stand out as an iOS developer and pass every job interview. It will guide you to build your developer brand and present your skills to potential employers. This comprehensive guide covers over 100 interview questions, from Swift fundamentals and frameworks to complex design patterns and app architecture. You'll learn how to approach coding assessments like a pro and avoid red flags that could hinder your chances of success. Drawing from the author’s experience of interviewing hundreds of iOS developers and having been a candidate themself, this book addresses the challenges of showcasing your skills and knowledge within a limited timeframe. By the end of this book, you'll be ready to excel in any iOS interview, demonstrating your strengths and confidently tackling even the most challenging questions, ultimately paving the way to secure the job you've always wanted.
Table of Contents (20 chapters)
Part 1: Everything about Interviews
Part 2: Swift Language and Coding
Part 3: The Frameworks
Part 4: Design and Architecture

Improving performance with Concurrency

Concurrency is a complex computer science topic, not only in iOS development. A bad design can lead to crashes, race conditions, deadlocks, and lags.

But don’t worry – do you remember what we said about design patterns in this chapter’s introduction? They are here to solve our problems. So, let’s review some of the design patterns and best practices for concurrency to see what tools we can add to our toolbox.

Working with GCD

GCD is a powerful concurrency framework that enables the efficient and scalable execution of tasks. GCD provides a simple way to create queues of tasks and schedule them for execution without managing threads manually. This makes it easy to write efficient and responsive code that takes full advantage of the available system resources.

Here is an example of how to use GCD to download an image asynchronously in the background:

func downloadImage(url: URL, completion: @escaping ...