Techwin Labs 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. 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

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. Swift basic questions
Add your answer

Q1. Basic of swift and some questions related to your past work experience.
Ans. 
Questions about basic Swift knowledge and past work experience.
• Basic Swift concepts such as optionals, closures, and protocols may be asked.

• Questions about past projects and how you approached problem-solving may also be asked.

• Examples of past work experience and projects may be requested.

• Questions about Swift syntax and best practices may be asked as well.
Answered by AI
Add your answer
Q2. Clean coding principles
Ans. 
Clean coding principles ensure code readability, maintainability, and scalability.
• Use meaningful variable and function names

• Keep functions short and focused

• Avoid code duplication

• Follow SOLID principles

• Write unit tests

• Refactor regularly
Answered by AI
Add your answer
Q3. They may ask your approaches to solve problems.
Add your answer

90mins of aptitude test after clearing interview

1hr of coding test then final interview

Quite good bother some skills

Q1. Strong communication skills required
Add your answer

Python programming language along with the c++