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iOS

IBOutlet not working (Swift)

I am trying to link the text field emailField in the .xib file to the .swift file (I'm not using the storyboard).

Here's the code:

class ViewController: UIViewController { @IBOutlet weak var emailField: UITextField!
}

However, the outlet does not show up in the File's Owner, and when I control-drag to the .swift file, I get an error saying "ViewController does not have an outlet named emailField.