@escaping in Swift

Uplift iOS Interview

"Uplift iOS Interview" is a comprehensive guide to help aspiring iOS developers soar to new heights in their careers. This book is an indispensable tool for anyone looking to crack the iOS interview and impress their future employers with their technical prowess. With in-depth coverage of Swift, AutoLayout, SwiftUI, Multithreading, Memory management so on and so forth, this book is a treasure trove of knowledge for anyone looking to uplift their iOS development career.

In Swift, the @escaping keyword is used to indicate that a closure (a block of code that can be passed around and executed at a later time) may be called after the function it was passed to has completed execution.

When a closure is passed as an argument to a function, it is captured by that function and can only be executed while the function is still running. This is known as a non-escaping closure. However, if the closure may be executed after the function has completed, it is called an escaping closure.

To indicate that a closure is escaping, you can add the @escaping keyword before the parameter type in the function definition. For example:

func performTask(with closure: @escaping () -> Void) {
    // Perform some task
    closure()
}

In this example, the performTask function takes a single argument, a closure of type () -> Void, and it marked as @escaping. This means that the closure passed as an argument to this function may be executed after the function has completed.

It is important to note that when you mark a closure as @escaping, you are responsible for ensuring that the closure is executed at some point in the future, otherwise it will result in a memory leak.

You can also use @escaping in combination with other attributes, such as @autoclosure and @noescape. @autoclosure allows you to pass an expression as a closure, and @noescape indicates that the closure will not be executed after the function has completed.

In conclusion, @escaping is a powerful feature in Swift that allows you to pass closures as arguments to functions, and enables you to perform tasks asynchronously. By marking a closure as @escaping, you ensure that the closure can be executed after the function has completed, and it is important to remember that you are responsible for ensuring that the closure is executed at some point in the future.


Rev Up Your iOS Skills: Take a Dynamic Learning Journey
iOS Career Boost

iOS Career Boost is the ultimate learning journey to elevate your iOS development career through a dynamic blend of visual learning, handy cheat sheets, coding practice materials, and expertly curated tips and tricks


Get Ready to Shine: Mastering the iOS Interview


Enjoying the articles? Get the inside scoop by subscribing to my newsletter.

Get access to exclusive iOS development tips, tricks, and insights when you subscribe to my newsletter. You'll also receive links to new articles, app development ideas, and an interview preparation mini book. Your email address will only be used for the purpose of sending the newsletter and will not be shared with third parties or advertisers. Rest assured that we value your privacy and will not spam your inbox.


Connect with me on

Twitter and LinkedIn and don't hesitate to reach out with any questions about this post. Thank you for reading.

If you know someone who would benefit from reading this article, please share it with them.