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ChatWise IOS Developer Interview Questions and Answers
ChatWise IOS Developer Interview Experiences
2 interviews found
Anonymous
Selected
I applied via Approached by Company and was interviewed before Nov 2023. There was 1 interview round.
(3 Questions)
- Q1. What are delegates, notification center in iOS?
- Ans.
Delegates and notification center are key components in iOS development for communication between objects and broadcasting events.
Delegates are used for one-to-one communication between objects, allowing one object to act on behalf of another.
Notification center is used for broadcasting events to multiple objects, allowing for loosely coupled communication.
Delegates are commonly used in UITableView and UICollectionView...
- Q2. Weak vs strong references?
- Ans.
Weak references do not keep a strong hold on an object, allowing it to be deallocated if no strong references exist.
Weak references are used to avoid retain cycles in iOS development.
Strong references keep a strong hold on an object, preventing it from being deallocated as long as the strong reference exists.
Weak references are declared as 'weak var' or 'weak let', while strong references are the default in Swift.
Examp...
- Q3. Caching techniques
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Internshala and was interviewed before Jun 2023. There was 1 interview round.
(2 Questions)
- Q1. Struct vs Classes
- Ans.
Structs are value types, classes are reference types in Swift.
Structs are passed by value, classes are passed by reference.
Structs are copied when assigned to a new variable, classes are not.
Structs do not support inheritance, classes do.
- Q2. Singleton design pattern
Interview Preparation Tips
Skills evaluated in this interview
Interview questions from similar companies
Interview Questionnaire
6 Questions
- Q1. What’s difference between class and structure
- Ans.
Classes and structures are both used to define custom data types, but they have some key differences.
Classes are reference types, while structures are value types.
Classes support inheritance, while structures do not.
Classes have deinitializers, while structures do not.
Classes have reference counting for memory management, while structures do not.
Classes can have optional property types, while structures cannot.
- Q2. What’s retain cycle how you can avoid
- Ans.
Retain cycle is a memory management issue where objects reference each other and cannot be released. It can be avoided by using weak or unowned references.
Retain cycle occurs when two or more objects hold strong references to each other.
To avoid retain cycle, use weak or unowned references instead of strong references.
Weak references do not increase the reference count of an object and automatically become nil when the...
- Q3. What’s opinion binding
- Ans.
Opinion binding is a legal doctrine that requires judges to follow the decisions of higher courts in similar cases.
Opinion binding is also known as stare decisis.
It helps to ensure consistency and predictability in the legal system.
For example, if a higher court has already ruled that a certain law is unconstitutional, lower courts must follow that ruling in similar cases.
Opinion binding can be controversial, as it can...
- Q4. Difference between GCD and operation Queues
- Ans.
GCD and Operation Queues are both used for concurrent programming in iOS, but differ in their approach.
GCD is a C-based API that uses a thread pool model for concurrency.
Operation Queues are built on top of GCD and provide a higher-level abstraction for concurrency.
GCD is best for simple, lightweight tasks, while Operation Queues are better for more complex tasks with dependencies.
GCD uses blocks for task execution, wh...
- Q5. Explain the Life cycle of iOS applications
- Ans.
The life cycle of iOS applications refers to the stages an app goes through from launch to termination.
The app is launched by the user or system
The app enters the foreground and becomes active
The app can be sent to the background or suspended
The app can be terminated by the user or system
The app can be resumed from the background or suspended state
The app can receive memory warnings and handle them appropriately
- Q6. Explain the life cycle of UIviewController
- Ans.
The UIViewController life cycle consists of several stages that occur when the view controller is loaded and unloaded.
viewDidLoad() - called when the view controller's view is loaded into memory
viewWillAppear() - called just before the view appears on the screen
viewDidAppear() - called just after the view appears on the screen
viewWillDisappear() - called just before the view disappears from the screen
viewDidDisappear()...
Skills evaluated in this interview
I applied via Recruitment Consulltant and was interviewed before Feb 2021. There was 1 interview round.
(1 Question)
- 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...
Interview Preparation Tips
Skills evaluated in this interview
(1 Question)
- Q1. Basic of Swift and Objective C
(1 Question)
- Q1. Pure Technical Asking about your Project
(1 Question)
- Q1. Salary Descussion with HR and normal HR Question
Interview Preparation Tips
I applied via Walk-in and was interviewed before Sep 2023. There were 2 interview rounds.
(14 Questions)
- 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 ...
- 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...
- 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
- Q4. Solid principles
- Q5. Coredata stack questions
- Q6. Swift Optional related
- Q7. About GCD, Concurrency
- Q8. Dependency injection and inversion
- Q9. About singleton, is it thread safe ?
- Q10. Guard let, if let difference
- Q11. Failable initialisers
- 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
- Q13. About protocols, associated type, delegate examples
- Q14. About identifiable protocol
(1 Question)
- 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
Skills evaluated in this interview
I applied via Company Website and was interviewed in Jul 2020. There was 1 interview round.
Interview Questionnaire
4 Questions
- Q1. All basics of swift. Enums optionals closures protocols etc
- Q2. Best feature you like of swift
- Q3. App live all steps
- Q4. Certificates information
Interview Preparation Tips
Interview Questionnaire
2 Questions
- Q1. Struct vs Class
- Ans.
Struct is value type while Class is reference type in Swift. Structs are passed by value while Classes are passed by reference.
Structs are ideal for small data types like coordinates, colors, etc.
Classes are ideal for larger data types like view controllers, network managers, etc.
Structs are immutable by default while Classes are mutable.
Structs cannot inherit from other types while Classes can.
Structs are stack alloca
- Q2. MultiThreading Related Questions
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Campus Placement and was interviewed before Apr 2023. There were 2 interview rounds.
90mins of aptitude test after clearing interview
1hr of coding test then final interview
Selected
I applied via LinkedIn and was interviewed before May 2023. There was 1 interview round.
(3 Questions)
- 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...
- 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 {}
- Q3. Solid principles
Skills evaluated in this interview
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ChatWise IOS Developer Interview Process
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