为什么没有调用touchesBegan侦听器(Swift 4)？开发者社区

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class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
//        add my button
        let button = Btn()
        view.addSubview(button)
class Btn: UIControl {
    fileprivate let button: UIButton = {
        let swapButton = UIButton()
        let size = CGFloat(50)
        swapButton.frame.size = CGSize(width: size, height: size)
        swapButton.backgroundColor = UIColor.green
        return swapButton
    override init(frame: CGRect) {
        super.init(frame: frame)
        addSubview(button)
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        addSubview(button)
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        //        Why it not called?
        print("test")
}

import PlaygroundSupport
import UIKit
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        //        add my button
        let button = Btn(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        view.addSubview(button)
class Btn: UIControl {
    fileprivate let button: UIButton = {
        let swapButton = UIButton()
        let size = CGFloat(50)
        swapButton.frame.size = CGSize(width: size, height: size)
        swapButton.backgroundColor = UIColor.green
        return swapButton
    override init(frame: CGRect) {
        super.init(frame: frame)
        addSubview(button)
        self.backgroundColor = .red
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        addSubview(button)
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)

问 为什么没有调用touchesBegan侦听器(Swift 4)？

回答 1

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