如何在iOS8中设置UIAlertController的高度和宽度

import UIKit

class CustomAlertViewController: UIAlertController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置标题和消息
        self.title = "Custom Alert"
        self.message = "This is a custom alert with adjusted size."
        
        // 添加按钮
        let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
        self.addAction(okAction)
        
        // 尝试添加一个自定义视图来影响尺寸
        let customView = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 200))
        customView.backgroundColor = .white
        customView.layer.cornerRadius = 10
        customView.layer.masksToBounds = true
        
        // 添加一个标签到自定义视图
        let label = UILabel()
        label.text = "Custom View Inside Alert"
        label.textAlignment = .center
        customView.addSubview(label)
        
        // 将自定义视图作为子视图添加到 UIAlertController 的 view 上
        self.view.addSubview(customView)
        
        // 设置自定义视图的约束
        customView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            customView.widthAnchor.constraint(equalToConstant: 300),
            customView.heightAnchor.constraint(equalToConstant: 200),
            customView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
            customView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor)
        ])
    }
}

// 使用自定义的 UIAlertController
let customAlert = CustomAlertViewController()
present(customAlert, animated: true, completion: nil)