// 这样写就会崩溃
addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(cancel)))
@objc private func cancel() {
}
// 这样写就不会崩溃
addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(cancel(_:))))
@objc private func cancel(_ gesture: UITapGestureRecognizer) {
}
