A string used to identify a reusable header or footer.
- iOS 6.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
You assign a reuse identifier to a header or footer view at creation time. Once assigned, the table view uses that reuse identifier to gather your views when they are scrolled offscreen and queue them for later reuse. You can retrieve header or footer views by passing the same reuse identifier to the
dequeue method of the table view.