// 這樣寫就會(huì)崩潰
addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(cancel)))
@objc private func cancel() {
? ? }
// 這樣寫就不會(huì)崩潰
addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(cancel(_:))))
@objc private func cancel(_ gesture: UITapGestureRecognizer) {
? ? }
