Saisystems Technology IOS Developer Interview Questions and Answers

Q1. Arc in swift...
Ans. 
ARC (Automatic Reference Counting) in Swift is a memory management system used to automatically manage memory allocation and deallocation.
• ARC keeps track of how many references there are to an object and automatically deallocates it when there are no more references.

• Use strong reference cycles can lead to memory leaks, so use weak or unowned references to break the cycle.

• ARC is the default memory management system in S...read more
Answered by AI
Add your answer
Q2. Automstic referenc counting
Add your answer

Q1. Mvvm in swift....
Ans. 
MVVM (Model-View-ViewModel) is an architectural design pattern commonly used in iOS development to separate concerns and improve code maintainability.
• MVVM separates the user interface (View) from the business logic (ViewModel) and data (Model).

• ViewModel acts as an intermediary between the View and the Model, handling user interactions and updating the data.

• Swift provides tools like Combine framework for reactive progra...read more
Answered by AI
Add your answer
Q2. Model view viewmodel
Add your answer

Q1. Basic Swift and Objective c
Add your answer
Q2. Deep into iOS Swift and Objective C
Add your answer

Q1. Deep in Development and Coding test
Add your answer
Q2. Management related questions
Add your answer

Q1. How do you manage local data?
Ans. 
Local data is managed using Core Data framework in iOS development.
• Use Core Data framework to create, read, update, and delete local data.

• Utilize entities, attributes, and relationships to model the data.

• Implement fetch requests to retrieve data based on specific criteria.

• Use NSManagedObject subclasses to represent data objects.

• Utilize NSPersistentContainer to manage the Core Data stack.
Answered by AI
Add your answer
Q2. How can you create dynamic UI like amazon?
Ans. 
Dynamic UI like Amazon can be created using a combination of responsive design, data-driven content, and user personalization.
• Utilize responsive design principles to ensure the UI adapts to different screen sizes and devices.

• Implement data-driven content to display relevant information based on user preferences and behavior.

• Use user personalization techniques such as recommendations, personalized product suggestions, a...read more
Answered by AI
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. 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. 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. What is serialisation in API
Ans. 
Serialisation in API is the process of converting data into a format that can be easily transmitted over a network.
• Serialisation is used to convert complex data structures into a format that can be easily transmitted over a network.

• It involves converting objects or data structures into a stream of bytes that can be sent over a network.

• JSON and XML are commonly used formats for serialising data in APIs.

• Serialisation is ...read more
Answered by AI
Add your answer
Q2. What is codable
Ans. 
Codable is a protocol in Swift that allows for easy encoding and decoding of data types to and from external representations.
• Codable protocol is used to convert custom data types to and from external representations such as JSON, plist, etc.

• It requires the types to conform to Encodable and Decodable protocols.

• Codable protocol provides default implementations for encoding and decoding.

• Example: struct Person: Codable { v...read more
Answered by AI
Add your answer
Q3. What is MVVM architecture
Ans. 
MVVM is an architectural design pattern that separates the user interface code from the business logic and data model.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View displays the UI elements and interacts with the user

• ViewModel acts as a mediator between the Model and View, handling user inputs and updating the Model

• MVVM helps in achieving separation of concerns and making the code
Answered by AI
Add your answer
Q4. Solid principles
Add your answer
Q5. Coredata stack questions
Add your answer
Q6. Swift Optional related
Add your answer
Q7. About GCD, Concurrency
Add your answer
Q8. Dependency injection and inversion
Add your answer
Q9. About singleton, is it thread safe ?
Add your answer
Q10. Guard let, if let difference
Add your answer
Q11. Failable initialisers
Add your answer
Q12. Class struct difference
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.

• Classes support inheritance, while structs do not.

• Classes can have deinitializers, while structs cannot.

• Example: class Person { var name: String } vs struc
Answered by AI
Add your answer
Q13. About protocols, associated type, delegate examples
Add your answer
Q14. About identifiable protocol
Add your answer

Q1. When you can join
Ans. 
I can join within 2 weeks of receiving an offer.
• I can start within 2 weeks of receiving an offer

• I need to give notice at my current job before starting

• I have some personal commitments that I need to wrap up before joining
Answered by AI
Add your answer