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Objective-C Interview Questions and Answers

This page provides a complete collection of Objective-C Interview Questions and Answers designed for iOS developers, mobile app developers, software engineers, and candidates preparing for Apple development interviews.

Objective-C is an object-oriented programming language created as an extension of C. It was the primary programming language used for Apple platforms before Swift and continues to be important for maintaining legacy iOS, macOS, and Cocoa applications.

This interview guide covers beginner, intermediate, and advanced Objective-C concepts including syntax, classes, objects, memory management, ARC, properties, protocols, delegates, blocks, Objective-C runtime, Foundation framework, UIKit, and real-world iOS development scenarios.

Difficulty
Beginner to Advanced
Topics Covered
Objective-C, iOS, Cocoa
Examples
Objective-C Code Examples
Updated
July 2026

Why Learn Objective-C?

Objective-C remains an important language for developers working with existing Apple applications. Many enterprise iOS projects still use Objective-C codebases that require maintenance and enhancement.

Understanding Objective-C helps developers work with Apple's runtime system, memory management concepts, Cocoa frameworks, and legacy iOS applications.

Topics Covered in Objective-C Interview Questions

  • Objective-C Fundamentals
  • C and Objective-C Differences
  • Classes and Objects
  • Methods and Messages
  • Properties and Variables
  • Inheritance
  • Memory Management
  • Automatic Reference Counting (ARC)
  • Protocols and Delegates
  • Blocks
  • Objective-C Runtime
  • UIKit and Foundation Framework
Beginner
1. What is Scratch?
Scratch is a block-based visual programming language developed by MIT that helps beginners learn coding concepts using drag-and-drop blocks.
Beginner
2. Who developed Scratch?
Scratch was developed by the Lifelong Kindergarten Group at MIT Media Lab.
Beginner
3. What is a Sprite?
A Sprite is a character or object that performs actions in a Scratch project.
Beginner
4. What is the Stage in Scratch?
The Stage is the background area where sprites perform actions.
Beginner
5. What are Blocks in Scratch?
Blocks are visual programming pieces that snap together to create scripts.
Beginner
6. What is a Script?
A script is a set of connected blocks that control a sprite’s behavior.
Beginner
7. What are Costumes?
Costumes are different appearances of a sprite used for animation.
Beginner
8. What are Backdrops?
Backdrops are background images used on the Stage.
Beginner
9. What is the Green Flag used for?
The Green Flag starts the execution of scripts in a project.
Beginner
10. What is a Variable in Scratch?
A variable stores data such as score, name, or number values.
Intermediate
11. What is a List in Scratch?
A list stores multiple values in a single variable structure.
Intermediate
12. What are Broadcast messages?
Broadcast messages allow communication between sprites.
Intermediate
13. What are Loops in Scratch?
Loops repeat a set of instructions multiple times (forever, repeat, repeat until).
Intermediate
14. What is Conditional Logic?
Conditional logic uses if and if-else blocks to make decisions.
Intermediate
15. What are Operators?
Answer Here
Intermediate
16. What is Cloning in Scratch?
Cloning creates multiple copies of a sprite during runtime.
Intermediate
17. What are Events?
Events trigger scripts, such as when green flag clicked or key pressed.
Intermediate
18. What is the difference between forever and repeat?
Forever runs infinitely, while repeat runs a fixed number of times.
Intermediate
19. How do you detect collision?
Using "touching sprite?" or "touching color?" sensing blocks.
Intermediate
20. What are Coordinates in Scratch?
Scratch uses X and Y coordinates to position sprites on the stage.
Advanced
21. What are Custom Blocks?
Custom blocks (My Blocks) allow you to create reusable functions.
Advanced
22. What is Recursion in Scratch?
Recursion occurs when a custom block calls itself repeatedly.
Advanced
23. How do you create a scoring system?
Create a variable named score and update it using change score by block.
Advanced
24. How do you create gravity effect?
Use change y by negative value inside a loop to simulate gravity.
Advanced
25. How to make a scrolling background?
Use two backdrops or sprites and continuously move them to create scrolling effect.
Coding Round
26. Move sprite 10 steps continuously
Answer Here
Coding Round
27. Change color when sprite touches edge
Answer Here
Coding Round
28. Increase score when touching coin
Answer Here
Coding Round
29. Create jump functionality
Answer Here
Coding Round
30. Rotate sprite continuously
Answer Here
Advanced
31. What is Cloud Variable?
Cloud variables store data online and are shared across users.
Advanced
32. What are Extensions?
Extensions add extra blocks like Pen, Music, Video Sensing, etc.
Intermediate
33. What is Debugging?
Debugging is the process of finding and fixing errors in scripts.
Intermediate
34. How to stop all scripts?
Use the Stop All block.
Coding Round
35. Make sprite follow mouse
Answer Here
Coding Round
36. Random movement
Answer Here
Advanced
37. What is Parallel Execution?
Multiple scripts running at the same time in Scratch.
Beginner
38. What file extension does Scratch use?
Scratch project files use .sb3 extension.
Intermediate
39. How to create animation?
Switch between costumes quickly using next costume block.
Coding Round
40. Countdown timer
Answer Here
Advanced
41. What is Game Loop?
A forever loop that continuously checks conditions and updates game logic.
Coding Round
42. Bounce off wall
if on edge, bounce
Beginner
43. What is the Pen extension?
It allows sprites to draw lines and shapes on the stage.
Intermediate
44. What is Sensing block?
Sensing blocks detect conditions like touching, mouse position, key press.
Advanced
45. How to optimize large Scratch projects?
Use custom blocks, reduce clones, and organize scripts properly.
Coding Round
46. Make sprite disappear after 3 seconds
Answer here
Coding Round
47. Show Game Over message
Answer Here
Advanced
48. What is Event-driven programming?
Programming where actions happen in response to events like clicks or key presses.
Coding Round
49. Create simple enemy clone system
Answer Here
Advanced
50. What skills does Scratch teach?
Scratch teaches logic building, problem solving, computational thinking, and programming fundamentals.

Continue Your iOS Development Interview Preparation

Objective-C interviews often include questions related to iOS development, Swift programming, mobile architecture, memory management, APIs, and software design patterns. Preparing related technologies helps developers perform better in technical interviews.

Swift Interview Questions
iOS Interview Questions
C Interview Questions
SwiftUI Questions

Why Learn Objective-C for iOS Development?

Objective-C provides deep integration with Apple's Cocoa frameworks and offers powerful runtime features that allow dynamic programming capabilities.

Developers who understand Objective-C can maintain older iOS applications, work with existing enterprise projects, and understand the foundation behind modern Apple development technologies.

Recommended Objective-C Learning Path

  • Objective-C Basics
  • Syntax and Data Types
  • Classes and Objects
  • Methods and Messaging
  • Properties
  • Memory Management
  • ARC Concepts
  • Protocols and Delegates
  • Blocks Programming
  • Cocoa Frameworks
  • UIKit Development
  • Real-Time iOS Projects

Tips to Crack Objective-C Interviews

During Objective-C interviews, candidates should understand object oriented programming, memory management, ARC, protocols, delegates, runtime behavior, and iOS application development concepts.

Practice creating small iOS applications and understand how Objective-C interacts with Apple's frameworks. Practical knowledge is important for experienced developer roles.

About This Objective-C Interview Guide

This Objective-C Interview Questions and Answers guide is created to help beginners, iOS developers, and software professionals prepare for Objective-C technical interviews.

The guide covers Objective-C fundamentals, advanced programming concepts, iOS development practices, and practical interview scenarios required for modern mobile development roles.