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

Decoupling with Dependency Injection

DI is a powerful pattern that helps us to create modular and testable code. It’s another tool in our toolbox that can help us make our code flexible and decoupled.

There are several ways to implement DI in iOS, which are discussed next.

Using constructor injection

This is the most common form of DI in iOS. In constructor injection, dependencies are passed into an object through its initializer. For example, if we have a view controller that depends on a data manager, we can inject the data manager into the view controller’s initializer.

In the following code example, we created a custom init() function and a private variable to hold the injected data manager:

class MyViewController: UIViewController {    private let dataManager: DataManager
    init(dataManager: DataManager) {
        self.dataManager = dataManager