NSFetchedResultsController titleForHeaderInSection with formatted NSDate

Question

In my Core Data app I am using a FetchedResultsController. Usually to set titles for headers in a UITableView you would implement the following method like so:

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Answer 1

This is the Swift version of the answer:

override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {        
    let sectionInfo = fetchedResultsController.sections![section]
    let objects = sectionInfo.objects
    if let topRecord:NSManagedObject = objects![0] as? NSManagedObject  {
        let formatter = DateFormatter()
        formatter.dateStyle = .medium
        return formatter.string(from: topRecord.value(forKey: "itemDate") as! Date)
    } else {
        return sectionInfo.indexTitle
    }
}