如何在iOS中模糊自定义按钮的标题，如系统UIButton的标题？

import UIKit
import CoreImage

class ViewController: UIViewController {
    
    @IBOutlet weak var customButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置按钮标题
        customButton.setTitle("Custom Button", for: .normal)
        
        // 创建模糊滤镜
        let blurFilter = CIFilter(name: "CIGaussianBlur")
        
        // 设置滤镜参数
        blurFilter?.setValue(10, forKey: kCIInputRadiusKey)
        
        // 获取按钮标题的图像
        let titleImage = customButton.titleLabel?.snapshotView(afterScreenUpdates: true)
        
        // 将图像转换为CIImage
        let ciImage = CIImage(image: titleImage?.image ?? UIImage())
        
        // 应用滤镜
        blurFilter?.setValue(ciImage, forKey: kCIInputImageKey)
        
        // 获取模糊处理后的图像
        let outputImage = blurFilter?.outputImage
        
        // 将CIImage转换为UIImage
        let blurredImage = UIImage(ciImage: outputImage ?? CIImage())
        
        // 设置按钮标题为模糊图像
        customButton.setTitle(blurredImage, for: .normal)
    }
}