for i in 0..<5 {
    let button = UIButton(type: .system)
    button.frame = CGRect(x: 100, y: 100 + i * 60, width: 200, height: 50)
    button.setTitle("按钮 \(i+1)", for: .normal)
    button.backgroundColor = .lightGray
    button.tag = i // 设置tag以便区分不同按钮
    button.addTarget(self, action: #selector(buttonClicked(_:)), for: .touchUpInside)
    view.addSubview(button)
}

@objc func buttonClicked(_ sender: UIButton) {
    print("点击了按钮 \(sender.tag + 1)")
}

var buttons = [UIButton]()

for i in 0..<5 {
    let button = UIButton(type: .system)
    button.frame = CGRect(x: 100, y: 100 + i * 60, width: 200, height: 50)
    button.setTitle("按钮 \(i+1)", for: .normal)
    button.tag = i
    buttons.append(button)
    view.addSubview(button)
}

var previousButton: UIButton?

for i in 0..<5 {
    let button = UIButton(type: .system)
    button.translatesAutoresizingMaskIntoConstraints = false
    button.setTitle("按钮 \(i+1)", for: .normal)
    button.tag = i
    view.addSubview(button)
    
    NSLayoutConstraint.activate([
        button.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
        button.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
        button.heightAnchor.constraint(equalToConstant: 50)
    ])
    
    if let prev = previousButton {
        button.topAnchor.constraint(equalTo: prev.bottomAnchor, constant: 20).isActive = true
    } else {
        button.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20).isActive = true
    }
    
    previousButton = button
}