FISSION TECHNO SOLUTIONS IOS Developer Interview Questions and Answers

Q1. What is optional, difference between struct and class?
Ans. 
Optional is a type in Swift that can hold a value or be nil. Struct and class are both used to define custom data types.
• Optional is denoted by a question mark (?) and is used to handle nil values.

• Structs are value types and are passed by value, while classes are reference types and are passed by reference.

• Structs have a default memberwise initializer, while classes do not.

• Classes can inherit from other classes, while s...read more
Answered by AI
Add your answer

Q1. Basic of Swift and Objective C
Add your answer

Q1. Pure Technical Asking about your Project
Add your answer

Q1. Salary Descussion with HR and normal HR Question
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

90mins of aptitude test after clearing interview

1hr of coding test then final interview

Q1. Difference between retain, copy and strong?
Ans. 
Retain, copy, and strong are all memory management keywords in Objective-C used to manage object ownership.
• Retain: Increases the retain count of an object, ensuring it is not deallocated as long as there are references to it.

• Copy: Creates a new copy of an object, ensuring that changes to the original object do not affect the copied object.

• Strong: Similar to retain, it increases the retain count of an object and ensures...read more
Answered by AI
Add your answer
Q2. Difference between class and struct?
Ans. 
Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they point to the same memory location 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 {} vs struct Point {}
Answered by AI
Add your answer
Q3. Solid principles
Add your answer

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