iOS 自定义功能界面点击空白处隐藏的优雅解法

先上一段代码，具体的用法后面补上：

let tap = UITapGestureRecognizer.init(target: self, action: #selector(tapEvent))
tap.delegate = self
self.isUserInteractionEnabled = true
self.addGestureRecognizer(tap)

/// tap event
@objc private func tapEvent() {
	isHidden = true
}     

/// MARK: - UIGestureRecognizerDelegate
extension FilterByTimeContentView: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        if touch.view?.isDescendant(of: m_collectionView) ?? true {
            return false
        }
        return true
    }
}