Responding to Editing Notifications

• textViewShouldBeginEditing(_:)
• textViewDidBeginEditing(_:)
• textViewShouldEndEditing(_:)
• textViewDidEndEditing(_:)

Responding to Text Changes

• textView(_:shouldChangeTextIn:replacementText:)
• textViewDidChange(_:)

Responding to URL

• textView(_: UITextView, shouldInteractWithURL: NSURL, inRange: NSRange) -> Bool