Fablian Technologies IOS Developer Interview Questions and Answers

Q1. Some basic Questions related to iOS concepts.
Add your answer
Q2. Multithreading and multitasking.
Add your answer

Q1. Advanced iOS Questions.
Add your answer
Q2. API Calling, Json Parsing
Add your answer

Q1. Basic interview swift questions (medium to hard)
Add your answer
Q2. Coding to find correct or whats wrong
Add your answer

Machine test with collection view and api using url session

Q1. Technical questions of different scenarios
Add your answer

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.
Answered by AI
Add your answer
Q2. Keychain access in swift
Ans. 
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.
Answered by AI
Add your answer
Q3. Class vs struct
Ans. 
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
Answered by AI
Add your answer
Q4. If let and guard let
Add your answer
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.
Answered by AI
Add your answer

Q1. GCD, Operation queue, struct vs class, some small logical coding ,
Add your answer

Q1. GCD, operation queue, URL Session tasks, ref type , value tyep,
Add your answer

Q1. Basic and discussion about Job offer
Add your answer

Q1. Objective C vs swift
Ans. 
Objective-C is the older language used for iOS development, while Swift is the newer, more modern language.
• Objective-C is a superset of C with Smalltalk-style messaging syntax.

• Swift is more concise and easier to read than Objective-C.

• Swift is safer due to its optionals and type interference features.

• Objective-C has been around longer and has a larger codebase, but Swift is becoming more popular.

• Many developers prefer S...read more
Answered by AI
Add your answer
Q2. Autolayouts and content
Add your answer

Q1. Do sorting without higher order functions, Remote notifications
Ans. 
Sorting without higher order functions and remote notifications
• Implement sorting algorithm like bubble sort, selection sort, or insertion sort without using built-in sort functions

• For remote notifications, use Apple Push Notification Service (APNs) to send notifications to users' devices
Answered by AI
Add your answer

Q1. App life cycle and app states?
Add your answer
Q2. Difference between MVVM and MVC
Ans. 
MVVM focuses on separation of concerns by introducing a ViewModel layer, while MVC combines the responsibilities of the Model and Controller.
• MVC stands for Model-View-Controller, where the Model represents the data, the View displays the data, and the Controller handles user input and updates the Model.

• MVVM stands for Model-View-ViewModel, where the ViewModel acts as an intermediary between the View and the Model, hand...read more
Answered by AI
Add your answer

Q1. What is difference between class and struct?
Ans. 
Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they are passed by reference, while structs are value types, passed by value.

• Classes support inheritance, while structs do not.

• Classes have deinitializers, while structs do not.

• Classes can have reference counting for memory management, while structs do not.

• Example: class Person {} vs struct Point {}
Answered by AI
Add your answer
Q2. What are optional?
Ans. 
Optionals are a feature in Swift that allow variables to have a value or be nil.
• Optionals are used to handle situations where a value may be missing.

• They are denoted by adding a '?' after the type declaration.

• Optionals must be unwrapped before their value can be used.

• Example: var name: String? = "John"

• Example: var age: Int? = nil
Answered by AI
Add your answer