GestureRecognizer

GestureRecognizer.swift

protocol CollapsibleTableViewHeaderDelegate {
    func toggleSection(header: CollapsibleTableViewHeader, section: Int)
}
class CollapsibleTableViewHeader: UITableViewHeaderFooterView {
    var delegate: CollapsibleTableViewHeaderDelegate?
    var section: Int = 0
    ...
    override init(reuseIdentifier: String?) {
        super.init(reuseIdentifier: reuseIdentifier)
        ...
        addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(CollapsibleTableViewHeader.tapHeader(_:))))
    }
    ...
    func tapHeader(gestureRecognizer: UITapGestureRecognizer) {
        guard let cell = gestureRecognizer.view as? CollapsibleTableViewHeader else {
            return
        }
        delegate?.toggleSection(self, section: cell.section)
    }
    func setCollapsed(collapsed: Bool) {
        // Animate the arrow rotation (see Extensions.swf)
        arrowLabel.rotate(collapsed ? 0.0 : .pi / 2)
    }
}