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

Sharing a state using Singleton

There are two questions that interviewers love to ask:

  • “How do we create a Singleton?”
  • “Is it good to have singletons in our app?”

The first question is technical, but the second one is tricky.

Let’s start with the definition of a Singleton.

What is a Singleton?

In the Singleton design pattern, there is only one instance of a class that can be globally accessed through a static property. It is often used to manage shared resources or states in a program where multiple instances could cause issues with synchronization or consistency. To implement a Singleton, a class typically has a private constructor and a static method or property that returns the single instance of the class.

In Swift, it is simple to create a Singleton. We use a static property for that task:

final class MySingleton {    static let shared = MySingleton()
    private init(...