Swift将GestureRecognizer添加到UIStackView顶部的视图

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建 UIStackView
        let stackView = UIStackView()
        stackView.axis = .vertical
        stackView.alignment = .center
        stackView.spacing = 10
        stackView.translatesAutoresizingMaskIntoConstraints = false
        
        // 创建顶部视图
        let topView = UIView()
        topView.backgroundColor = .blue
        topView.translatesAutoresizingMaskIntoConstraints = false
        
        // 创建其他视图
        let middleView = UIView()
        middleView.backgroundColor = .green
        middleView.translatesAutoresizingMaskIntoConstraints = false
        
        let bottomView = UIView()
        bottomView.backgroundColor = .red
        bottomView.translatesAutoresizingMaskIntoConstraints = false
        
        // 将视图添加到 StackView
        stackView.addArrangedSubview(topView)
        stackView.addArrangedSubview(middleView)
        stackView.addArrangedSubview(bottomView)
        
        // 添加 StackView 到视图控制器的视图
        view.addSubview(stackView)
        
        // 设置 StackView 的约束
        NSLayoutConstraint.activate([
            stackView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            stackView.widthAnchor.constraint(equalToConstant: 200),
            stackView.heightAnchor.constraint(equalToConstant: 200)
        ])
        
        // 创建 UITapGestureRecognizer 并添加到顶部视图
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap))
        topView.addGestureRecognizer(tapGesture)
        
        // 确保顶部视图可以接收手势
        topView.isUserInteractionEnabled = true
    }
    
    @objc func handleTap() {
        print("Top view tapped!")
    }
}