bindEvent is call when the view is init: class ShazamResultCard: UIView { override init(frame: CGRect) { super.init(frame: frame) setUpSubViews() layoutUI() bindEvent() } required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") } private func setUpSubViews() { //........ } private func layoutUI() { //........ } private func bindEvent() { //........ } }