Depex Technologies IOS Developer Interview Questions and Answers

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

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

diff is used to compare two collections and return the differences, while guard is used for early exit in a function if a condition is not met.

• diff is a method used in Swift to compare two collections and return the differences.

• guard is a keyword used in Swift to provide an early exit from a function if a condition is not met.

• Example: let array1 = [1, 2, 3, 4], array2 = [3, 4, 5, 6]; let result = array1.diff(array2) //...read more

GCD stands for Grand Central Dispatch, a technology used in iOS for managing concurrent operations. Multithreading is the ability of a CPU to execute multiple threads concurrently.

• GCD is used for managing tasks asynchronously and efficiently utilizing system resources.

• Multithreading allows multiple tasks to run concurrently, improving performance and responsiveness of an application.

• Example: Using GCD to download image...read more

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

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

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

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

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

I expect a competitive salary based on my experience and skills.

• I have a strong background in iOS development and have successfully completed several projects.

• I am familiar with the latest technologies and frameworks in iOS development.

• I have a proven track record of delivering high-quality code on time and within budget.

• I am confident that my skills and experience make me a valuable asset to any team.

• I am open to disc...read more

I worked as an iOS Developer at XYZ Company.

• Developed and maintained iOS applications using Swift and Objective-C.

• Collaborated with cross-functional teams to gather requirements and deliver high-quality products.

• Implemented new features and enhancements based on user feedback.

• Optimized app performance and resolved bugs and issues.

• Worked on integrating third-party libraries and APIs.

• Participated in code reviews and prov...read more

I am looking for a change to explore new opportunities and challenges in my career.

• Seeking growth and advancement in my professional journey

• Want to work on more challenging projects

• Desire to learn new technologies and expand my skillset

• Looking for a better work-life balance

• Seeking a company culture that aligns with my values and goals

I am an experienced iOS developer with a passion for creating user-friendly and efficient applications.

• I have been developing iOS applications for over 5 years.

• I am proficient in Swift and Objective-C programming languages.

• I have experience working with various frameworks and libraries such as UIKit, Core Data, and Alamofire.

• I have a strong understanding of iOS design patterns and best practices.

• I have successfully del...read more