Описание тега uitextinputtraits
The UITextInputTraits protocol defines features that are associated with keyboard input. All objects that support keyboard input must adopt this protocol in order to interact properly with the text input management system. The UITextField and UITextView classes already support this protocol.
The UITextInputTraits protocol defines features that are associated with keyboard input. All objects that support keyboard input must adopt this protocol in order to interact properly with the text input management system. The UITextField and UITextView classes already support this protocol.
Click Here for Apple Documentation of UITextInputTraits