Senior IOS Developer

Senior IOS Developer Interview Questions and Answers for Freshers

Updated 8 Jan 2025

Q1. What are the differences between the MVC and MVVM architectural patterns, and in what scenarios should each be used?

Ans.

MVC focuses on separating data, presentation, and logic, while MVVM adds a ViewModel layer to enhance data binding and separation of concerns.

MVC: Model-View-Controller pattern separates data, presentation, and logic. Views directly interact with Models and Controllers.
MVVM: Model-View-ViewModel pattern adds a ViewModel layer between the View and Model to enhance data binding and separation of concerns.
MVC is more traditional and widely used, while MVVM is gaining popularity ...read more

Q2. What are the differences between classes and structs, and when should each be used?

Ans.

Classes are reference types, while structs are value types. Classes are used for complex data structures, inheritance, and reference counting. Structs are used for simple data types and performance optimization.

Classes are reference types, stored on the heap, and support inheritance and reference counting. Use classes for complex data structures like objects, where identity matters.
Structs are value types, stored on the stack, and do not support inheritance. Use structs for s...read more

Q3. What are the key principles of memory management in iOS app development?

Ans.

Key principles of memory management in iOS app development include reference counting, autorelease pools, and avoiding retain cycles.

Use ARC (Automatic Reference Counting) to manage memory automatically
Avoid retain cycles by using weak references or unowned references
Use autorelease pools to manage memory for temporary objects

Q4. How do you integrate and maintain third-party libraries?

Ans.

Integrating and maintaining third-party libraries involves adding dependencies, managing versions, and updating as needed.

Use dependency management tools like CocoaPods or Carthage to easily add and update libraries
Regularly check for updates and security patches for third-party libraries
Ensure compatibility with existing codebase by testing thoroughly after integrating new libraries

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Q5. What is your knowledge of core animation?

Ans.

Core Animation is a powerful framework in iOS for creating animations and visual effects.

Core Animation is a high-performance framework for animating views and graphics on iOS devices.
It allows for smooth animations, transitions, and effects without compromising performance.
Core Animation uses layers to manage the visual content of your app, providing hardware-accelerated rendering.
You can create animations using keyframe animations, implicit animations, and transitions.
Examp...read more

Q6. Sorting and searching algorithm

Ans.

Sorting and searching algorithms are essential for efficient data manipulation and retrieval.

Sorting algorithms like quicksort, mergesort, and heapsort rearrange elements in a specific order.
Searching algorithms like binary search and linear search help find specific elements in a dataset.
Efficient algorithms can significantly improve performance in large datasets.

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