Input errors on iOS
Users should be notified when they make input errors. Show a clear error message when data has been entered incorrectly. Furthermore, provide suggestions that help users to fix the error. It is important that error messages are also posted to users of assistive technologies.
You could also use a third party library to displaying instructions. Unfortunately, accessibility is often not considered in the implementations.
errorLabel.isHidden = false errorLabel.text = "Invalid date, must be in the form DD/MM/YYYY, for example, 01/01/2000"