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

Storing sensitive information in the Keychain

UserDefaults is an excellent storing mechanism, but it is unsuitable for storing data such as passwords or tokens. Keychain is Apple’s solution for storing sensitive data, and it provides a higher level of security and is an essential tool for iOS developers to protect their data.

Storing data in the keychain is much more complex than using other solutions. The keychain provides a particular API, based on the C function, to prevent malicious hackers from reverse-engineering calls to that API. The keychain also requires more information when saving, so it can save and index it more efficiently.

Let’s see how to store a simple token in the keychain while wrapping it with a class for convenience:

import UIKitimport Security
class KeychainManager {
    private let serviceName = "MyAppTokenService"
    func saveToken(token: String) -> Bool {