Top iOS Interview Questions & Answers for 2025
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10 Jan, 2025
Most Common Objective-C Interview Questions
Objective-C is a general-purpose, object-oriented programming language that was created in the early 1980s. It is an extension of the C programming language, adding Smalltalk-style messaging and dynamic runtime features. Objective-C was the primary language for macOS and iOS application development before Swift was introduced by Apple in 2014.
07 Jan, 2025
Top iOS Interview Questions and Answers(2024)
Core Data is a powerful framework provided by Apple for managing the model layer of an iOS application. It is primarily used for object graph management and data persistence. Core Data allows developers to work with data in the form of objects and efficiently manage, store, and retrieve data from a variety of data stores (such as SQLite, XML, and binary).
07 Jan, 2025
Top iOS Interview Questions and Answers
The @objc attribute in Swift is used to expose Swift code (such as methods, properties, or classes) to the Objective-C runtime. This allows Swift code to be used with Objective-C features, such as dynamic dispatch, selectors, KVO (Key-Value Observing), and targets for actions. The @objc attribute is essential for interoperability between Swift and Objective-C, especially when working with APIs that require Objective-C runtime features.
07 Jan, 2025
Top iOS Interview Questions(2025)
The Model-View-Controller (MVC) design pattern is one of the most commonly used design patterns in iOS development. It is used to separate the concerns of an application into three distinct components: Model, View, and Controller. This separation helps make the application more modular, maintainable, and scalable.
07 Jan, 2025
Top iOS Interview Questions
In Swift, memory management is handled using Automatic Reference Counting (ARC), which tracks and manages the memory of objects. The way objects are referenced in memory is critical to avoid memory leaks and crashes. Swift provides three types of references: strong, weak, and unowned. These references define how objects are held in memory and how they are deallocated.
07 Jan, 2025
iOS Interview Questions and Answers
The UIViewController lifecycle refers to the sequence of methods that are called as a UIViewController object goes through different stages in its existence. These stages include creation, presentation, interaction, and destruction. Understanding the lifecycle helps developers manage view-related tasks, such as data loading, view configuration, and cleanup.
07 Jan, 2025
iOS Interview Questions(2024)
Key-Value Observing (KVO) is a mechanism in iOS (and macOS) that allows an object to be notified when a specific property of another object changes. It is part of the Cocoa and Cocoa Touch frameworks and provides a way for objects to observe changes to properties of other objects in a decoupled manner. This allows for an easy way to update your UI or trigger actions based on changes to an object's state.
07 Jan, 2025
iOS Interview Questions(2025)
Auto Layout is a powerful layout system in iOS that allows developers to create dynamic user interfaces that can adapt to different screen sizes, orientations, and content changes. It uses constraints to define the relationships between various elements in the UI and automatically adjusts the layout based on these rules.
31 Dec, 2024
Most Frequently asked macos Interview Questions (2024)
macOS is an operating system developed by Apple Inc. It is the primary operating system used on Apple's desktop and laptop computers, such as the MacBook, iMac, and Mac Pro. macOS is built on a Unix-based foundation and is known for its user-friendly interface, seamless integration with Apple's ecosystem, and strong emphasis on security, privacy, and performance.
30 Dec, 2024