swift-calendar-view-layout-header.swift

class CalendarHeader: UICollectionReusableView {

	@IBOutlet weak var monthLabel: UILabel!

	static let identifier = "calendarHeader"

	static func register(with collectionView: UICollectionView) {
		collectionView.register(UINib.init(nibName: "CalendarHeader", bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader , withReuseIdentifier: identifier)
	}

	static func dequeue(from collectionView: UICollectionView, at indexPath: IndexPath, forDate date: Date) -> CalendarHeader {
		let header = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: identifier, for: indexPath) as? CalendarHeader ?? CalendarHeader()

		let dateFormatter = DateFormatter()
		dateFormatter.locale = Locale(identifier: "en_GB")
		dateFormatter.setLocalizedDateFormatFromTemplate("MMMM yyyy")

		header.monthLabel.text = dateFormatter.string(from: date)

		return header
	}
}