Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Build a Self-Destructing Message iPhone App Designing and Starting the App Adding Login and Sign Up Screens

Segue -- Why sender: self?

Why is sender: self? When might sender be something different?

1 Answer

Segues are often anchored to UI elements (eg: a UIBarButtonItem) in the storyboard editor. Because a segue can be anchored to multiple UI elements, the particular element that triggers the segue is passed along as the sender. If you're calling performSegueWithIdentifier:sender: from a viewcontroller, sender: self indicates that the viewcontroller itself triggered the segue.