Ios Interview Questions For Senior Developer
iOS Interview Questions for Senior Developers
Ios Interview Questions For Senior Developer
In an iOS interview for a senior developer role, you can expect to be asked a variety of technical questions related to advanced iOS development concepts, Swift programming language, UIKit, concurrency, network programming, memory management, debugging techniques, and incorporating design patterns. Additionally, questions may focus on your experience in developing performant and scalable iOS applications, knowledge of the latest iOS features and frameworks, understanding of app submission process to the App Store, working with RESTful APIs, as well as your ability to lead a team, mentor junior developers, and make architectural decisions. Be prepared to showcase your problem-solving skills, experience in optimizing app performance, familiarity with security best practices, and ability to stay updated with evolving iOS technologies and trends.
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1 - Explain the difference between retain count and reference count in Objective C: Retain count is a legacy term used in manual memory management to indicate how many objects are retaining a particular object. Reference count, on the other hand, is used in Automatic Reference Counting (ARC) to track how many references there are to an object. In ARC, the compiler automatically inserts retain, release, and autorelease calls, removing the need for manual memory management.
2) Describe the role of delegates in iOS development: Delegates are a design pattern in which one object acts on behalf of or in coordination with another object. Delegates are widely used in iOS development to handle tasks such as data passing, user input, and controlling the flow of the application. By using delegates, objects can communicate and interact with each other in a loosely coupled manner.
3) What is a closure in Swift and how is it used? A closure is a self contained block of functionality that can be passed around and used in your code. Closures in Swift are similar to blocks in Objective C and are commonly used for tasks such as sorting collections, executing code asynchronously, and handling completion handlers. Closures capture and store references to any constants and variables from the context in which they are defined, allowing them to access and modify the values of those variables.
4) Explain the concept of memory management in iOS and how it has evolved over time: Memory management in iOS was initially done manually using methods such as retain, release, and autorelease. However, with the introduction of Automatic Reference Counting (ARC) in iOS 5, memory management became automated, reducing the likelihood of memory leaks and simplifying the development process. ARC automatically inserts retain and release calls at compile time, making memory management more efficient and less error prone.
5) Discuss the benefits of using Core Data for data persistence in iOS applications: Core Data is a powerful framework provided by Apple for managing the model layer objects in an iOS application. It offers features such as object graph management, versioning, and data persistence to store and retrieve data in a structured way. By using Core Data, developers can easily work with complex data models, perform efficient queries, and take advantage of built in functionalities like undo support and data validation. Overall, Core Data simplifies data management and improves the performance of iOS applications.
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