HostCell implementation of a UILabel for the Building apps with FunctionalTableData series

LabelCell.swift

typealias LabelCell = HostCell<UILabel, LabelState, LayoutMarginsTableItemLayout>

struct LabelState: Equatable {
	let text: String
	let font: UIFont
	let isMultiline: Bool
	
	init(text: String, font: UIFont = UIFont.systemFont(ofSize: 17), isMultiline: Bool = true) {
		self.text = text
		self.font = font
		self.isMultiline = isMultiline
	}
	
	// Use this function to update the state of the view. In this case,
	// updating the content of the `UILabel` with the passed state.
	// If the state is `nil`, this cell is about to be reused by `UITableView`
	// so prepare it to be reused.
	static func updateView(_ view: UILabel, state: LabelState?) {
		guard let state = state else {
			view.text = nil
			view.font = UIFont.systemFont(ofSize: 17)
			view.numberOfLines = 1
			view.lineBreakMode = .byTruncatingTail
			return
		}
		
		view.text = state.text
		view.font = state.font
		view.textColor = UIColor.body
		
		if state.isMultiline {
			view.numberOfLines = 0
			view.lineBreakMode = .byWordWrapping
		} else {
			view.numberOfLines = 1
			view.lineBreakMode = .byTruncatingTail
		}
	}
	
	static func ==(lhs: LabelState, rhs: LabelState) -> Bool {
		return lhs.text == rhs.text && lhs.font == rhs.font && lhs.isMultiline == rhs.isMultiline
	}
}