NEW: My new book Pro SwiftUI is out now – level up your SwiftUI skills today! >>

What is an IBOutlet?

Swift version: 5.6

Paul Hudson    @twostraws   

When you connect your storyboard to your code Xcode inserts two special markers: @IBAction and @IBOutlet. Both of these effectively do nothing when you build your app, but they are still important because Xcode uses them to understand which of your properties and methods are relevant to Interface Builder.

In the case of @IBOutlet, this is a connection from an Interface Builder user interface component – e.g. a UIButton – to a property in a view controller or other piece of Swift code. To the left of the code you should see a black circle with a ring around it, which is Xcode’s visual confirmation that a given @IBOutlet has an active connection.

If you’re using the assistant editor with IB in one pane and your code in the other, you can hover over that circle with your mouse pointer to see the UI component highlighted.

Hacking with Swift is sponsored by Play

SPONSORED Play is the first native iOS design tool created for designers and engineers. You can install Play for iOS and iPad today and sign up to check out the Beta of our macOS app with SwiftUI code export. We're also hiring engineers!

Click to learn more about Play!

Sponsor Hacking with Swift and reach the world's largest Swift community!

Available from iOS

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

BUY OUR BOOKS
Buy Pro Swift Buy Pro SwiftUI Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let us know!

Average rating: 3.8/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.