ios UIButton点击问题

Question

我添加了两个let getMoney = (amount, limits) => { let recur = (amount, nominals) => { if (amount == 0) return {}; // success if (!nominals.length) return; // failure let nominal = nominals[0]; let count = Math.min(limits[nominal], Math.floor(amount / nominal)); for (let i = count; i >= 0; i--) { let result = recur(amount - i*nominal, nominals.slice(1)); if (result) return i ? { [nominal]: i, ...result } : result; } } return recur(amount, Object.keys(limits).map(Number).sort((a,b) => b - a)); }; // count of nominals in ATM let limits = { 1000: 5, 500: 2, 100: 5, 50: 100, 30: 6 } console.log(getMoney(1000, limits)); // {1000: 1} console.log(getMoney(230, limits)); // {30: 1, 100: 2} console.log(getMoney(200, limits)); // {100: 2} console.log(getMoney(150, limits)); // {50: 1, 100: 1} console.log(getMoney(120, limits)); // {30: 4}，分别名为buttonA和buttonB，分别为UIButton。当我点击SubView时，将按预期调用buttonA函数，但是当我点击handleButtonA时，将同时调用buttonB和handleButtonA。无法理解如何解决此问题。这是代码。

handleButtonB

这太奇怪了，当我这样编写configUI函数时，效果很好。

 class ViewController: UIViewController {
    lazy var buttonA: UIButton = {
        let btn = UIButton(type: .system)
        btn.setTitle("buttonA", for: .normal)
        btn.setTitleColor(UIColor.white, for: .normal)
        btn.titleLabel?.font = UIFont.systemFont(ofSize: 13)
        btn.backgroundColor = .green
        btn.addTarget(self, action: #selector(handleButtonA), for: .touchUpInside)
        return btn
    }()

    lazy var buttonB: UIButton = {
        let btn = UIButton(type: .system)
        btn.backgroundColor = .red
        btn.setTitle("buttonB", for: .normal)
        btn.setTitleColor(UIColor.white, for: .normal)
        btn.titleLabel?.font = UIFont.systemFont(ofSize: 13)
        btn.addTarget(self, action: #selector(handleButtonB), for: .touchUpInside)
        return btn
    }()

    @objc func handleButtonA() {
        print("buttonA tapped")
    }

    @objc func handleButtonB() {
        print("buttonB tapped")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        configUI()
    }

    func configUI() {
        view.backgroundColor = .white

        view.addSubview(buttonA)
        buttonA.snp.makeConstraints {
            $0.left.bottom.equalToSuperview()
            $0.height.width.equalTo(80)
        }

        view.addSubview(buttonB)
        buttonB.snp.makeConstraints {
            $0.right.bottom.equalToSuperview()
            $0.height.width.equalTo(80)
        }
    }
}