Ariqt International IOS Developer Interview Questions and Answers

Q1. Swift basic questions like quard if let optionals
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Q1. Asked about leadership quality
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Q1. 1.Difference between class and struct?
Ans. 
Classes are reference types while structs are value types.
• Classes are passed by reference while structs are passed by value.

• Classes support inheritance while structs do not.

• Classes have a default initializer while structs do not.

• Classes can be deinitialized while structs cannot.

• Examples of classes include UIView and UIViewController while examples of structs include CGRect and CGPoint.
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Q2. Solid Principles, Inheritance and behavioral questions.
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Q1. Solid principle
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Q2. Weak and unowned reference difference
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Q3. All basic to advance question asked
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Q1. Basic information about yourself and salary discussion
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Q1. What is Protocol Oriented Programming
Ans. 
Protocol Oriented Programming is a programming paradigm in Swift that focuses on defining protocols to define behavior.
• POP is a way of designing code by defining protocols that describe a set of behaviors.

• It encourages composition over inheritance, allowing for more flexible and reusable code.

• By using protocols, you can define a blueprint of methods and properties that a type must implement.
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Q2. What is Concurrency
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Concurrency is the ability of a system to execute multiple tasks simultaneously.
• Concurrency allows multiple tasks to run at the same time, improving performance and responsiveness.

• It can be achieved through techniques like multithreading and asynchronous programming.

• Concurrency is important in iOS development for tasks like networking, data processing, and UI updates.
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Q3. What are types of memory management in iOS
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Types of memory management in iOS include Automatic Reference Counting (ARC) and Manual Reference Counting (MRC).
• Automatic Reference Counting (ARC) - manages memory automatically by keeping track of object references.

• Manual Reference Counting (MRC) - requires developers to manually manage memory by retaining and releasing objects.

• ARC is the default memory management system in iOS, while MRC is used in older codebases o...read more
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Fetch data from API and showcase it onto a table view in swift

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Q1. Encription and decription in swift
Ans. 
Encryption and decryption in Swift involves using cryptographic algorithms to encode and decode data securely.
• Use common encryption algorithms like AES or RSA for encryption.

• Implement encryption using libraries like CommonCrypto or CryptoSwift.

• Store encryption keys securely and use secure protocols for data transmission.

• Example: Encrypting a string using AES encryption in Swift.
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Q2. Keychain access in swift
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Keychain access in Swift allows secure storage of sensitive information like passwords, tokens, etc.
• Use Keychain Services API to securely store and retrieve sensitive data.

• Keychain items are stored securely in the device's keychain and are encrypted.

• Access keychain items using unique identifiers called keys.

• Use Keychain Swift library for easier implementation.
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Q3. Class vs struct
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Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they point to the same instance in memory when assigned to a new variable.

• Structs are value types, meaning they create a new copy when assigned to a new variable.

• Use classes for complex data structures or when you need inheritance, use structs for simple data types or when you want value semantics.

• Example: class Per...read more
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Q4. If let and guard let
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Q5. Grand central dispatch in swift
Ans. 
Grand Central Dispatch (GCD) is a technology in Swift for managing concurrent operations.
• GCD allows developers to perform tasks concurrently without having to manage threads manually.

• It provides a high-level API for managing tasks and executing them on different queues.

• Developers can use GCD to perform tasks in the background, update the UI on the main thread, and more.
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Q1. Singletone, multithreading, oops
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