在UIButton中更改标题的背景色

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let button = UIButton(type: .system)
        button.frame = CGRect(x: 100, y: 100, width: 200, height: 50)
        button.setTitle("Button", for: .normal)
        button.titleLabel?.font = UIFont.systemFont(ofSize: 20)
        
        // 设置按钮背景色
        let backgroundColor = UIColor.red
        let backgroundImage = imageWithColor(color: backgroundColor, size: button.frame.size)
        button.setBackgroundImage(backgroundImage, for: .normal)
        
        // 设置按钮标题颜色
        let titleColor = UIColor.white
        button.setTitleColor(titleColor, for: .normal)
        
        self.view.addSubview(button)
    }
    
    func imageWithColor(color: UIColor, size: CGSize) -> UIImage {
        let rect = CGRect(origin: .zero, size: size)
        UIGraphicsBeginImageContextWithOptions(rect.size, false, 0)
        color.setFill()
        UIRectFill(rect)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image!
    }
}