Swift and Objective-C are distinguishable in other ways, too. Swift also allows for defining methods in classes, enumeration, and structure, while Objective-C doesn’t and Swift can define classes in just one file, while Objective-C can’t. Additionally, while Objective-C doesn’t support dynamic libraries or Tuples, Swift does. The primary difference between Swift and Objective-C is that Swift is an open-source, functional, object-oriented programming language, while Objective-C is a class-based, object-oriented language that isn’t open-source. List key differences between Swift and Objective-C Generally, there are three types of closures: global functions, nested functions, and closure expressions. In Swift, closures are blocks of functionality that are fully self-contained, allowing them to be shifted around and used in different parts of the broader code, not unlike Objective-C blocks or lambdas in other programming languages. What are closures in Swift? Name their types By going beyond a simple list and discussing examples of when you’ve put various design patterns to work when you tackle this interview question, you could look like a stronger candidate. This is one of the most popular interview questions for senior iOS developer candidates, and it creates a unique opportunity for job seekers. ![]() Referred to as “core competency” design patterns by Apple, those recommended for iOS applications include Delegate, MVC, Observer, and Singleton. What are the common design patterns recommended for iOS applications? However, if it’s early in the interview, and more complicated questions are likely to arise, keeping your response to this question brief is also acceptable.ģ. When responding to this interview question, you can go into greater detail about what ARC may require. However, ARC may require details about relationships and dependencies within the code to improve its effectiveness. The underlying process limits the need for direct or manual memory management, since ARC frees up memory tapped by class instances once the instance isn’t required. ![]() How do you manage memory in Swift?Īutomatic Reference Counting - or ARC - is used to manage app memory usage when programming in Swift. ![]() Alternatively, you could discuss a recent project that made use of categories, allowing you to reference a specific example. If you want to take your answer to this interview question up a notch, you can discuss a faux category and how it would be implemented. This ensures that the main class remains concise, while allowing any needed methods or properties to be fully accessible. What are Objective-C categories?Ĭategories in Objective-C are a tool that adds functionality to an object without having to change the object itself or use subclassing. If you want to make sure that you’re ready, here is a look at some senior iOS developer interview questions and answers to help you prepare.
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