How to loop through view outlets in a UIViewController with Swift?

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This is what Outlet Collections are for. Drag all your textfields in the same Outlet Collection in InterfaceBuilder and create an @IBOutlet to that collection in your class file:

To create the outlet collection in InterfaceBuilder, ctrl-drag from the first UITextField to your class file in the assistant editor. Then choose Outlet Collection:

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ctrl-drag the next UITextField on that @IBOutlet to add it to the collection:

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Repeat that for all your textFields.

@IBOutlet var textFields: [UITextField]!

func checkTextFields() {
    for textField in self.textFields {
        ... // do your checks
    }
}

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