NEW! Master Swift design patterns with my latest book! >>

What is an IBOutlet?

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.

Available from iOS

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

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

Get the ultimate experience

The Swift Power Pack includes my first six books for one low price, helping you jumpstart a new career in iOS development – check it out!

MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>