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Segue -- Why sender: self?
Why is sender: self? When might sender be something different?
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.