如果UITextField (在相应的UIView中)被禁用，是否更改UILabel的颜色？(Swift)

import UIKit

class ViewController: UIViewController {
    
    let textField = UITextField()
    let label = UILabel()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置textField和label的初始属性
        textField.frame = CGRect(x: 20, y: 100, width: 200, height: 30)
        label.frame = CGRect(x: 20, y: 150, width: 200, height: 30)
        label.text = "Label Text"
        
        // 添加到视图
        view.addSubview(textField)
        view.addSubview(label)
        
        // 添加属性观察器
        textField.addObserver(self, forKeyPath: "isEnabled", options: [], context: nil)
    }
    
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "isEnabled" {
            updateLabelColor()
        }
    }
    
    func updateLabelColor() {
        if textField.isEnabled {
            label.textColor = .black // 或者其他启用时的颜色
        } else {
            label.textColor = .gray // 或者其他禁用时的颜色
        }
    }
    
    deinit {
        // 移除观察者以避免内存泄漏
        textField.removeObserver(self, forKeyPath: "isEnabled")
    }
}