The UITextViewDelegate protocol defines a set of optional methods you can use to receive editing-related messages for UITextView objects. All of the methods in this protocol are optional. You can use them in situations where you might want to adjust the text being edited (such as in the case of a spell checker program) or modify the intended insertion point.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.