Test: Swift - Implicit Unwrapping of Optionals
3. Which of the following lines are more likely to find in the UI code using story boards?
Congratulations! Correct Answer.
You Answered: None. If you took the test, your answer will show up here.
Correct Answer: @IBOutlet var textField: UITextField!; @IBOutlet var mapView: MKMapView!;
ExplanationWhen you connect the UI controls between a story board / xib file from Interface Builder into the code file of that particular view controller, you would typically make it implicitly unwrappable (i.e. by adding ! at the end of the type — UITextField! and MKMapView!). Since these are used as IB (Interface Builder) Outlets, you would also use the annotation @IBOutlet.
Take the TestTake the complete test on this topic. You will be able to review answers to questions and get a test score.
Take the Test
Question 3 of 5