Описание тега uitextinput
UITextInput is an iOS protocol that defines behaviors for interacting with and responding to text selection, autocorrection, and other text input events.
UITextInput is an iOS ( ios) protocol that defines behaviors for interacting with and responding to text selection, autocorrection, and other user text input events. It allows conforming classes to respond to dictation (on iOS 5.1+), modify selected text, position the selection UI elements, etc. UITextField ( uitextfield) and UITextView ( uitextview) are the two most commonly used classes that conform to the protocol.
For more information, please see the Apple Documentation for UITextInput.