如何为NSTextField的textColor设置动画效果？

import Cocoa

class ViewController: NSViewController {
    @IBOutlet weak var textField: NSTextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建一个CABasicAnimation对象
        let colorAnimation = CABasicAnimation(keyPath: "foregroundColor")
        
        // 设置动画的起始值和结束值
        colorAnimation.fromValue = NSColor.black.cgColor
        colorAnimation.toValue = NSColor.red.cgColor
        
        // 设置动画的持续时间
        colorAnimation.duration = 1.0
        
        // 设置动画的重复次数
        colorAnimation.repeatCount = .infinity
        
        // 将动画添加到textField的layer上
        textField.layer?.add(colorAnimation, forKey: "textColorAnimation")
    }
}