使用CGContext时的图像绘制问题.图像水平镜像

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let image = UIImage(named: "example")
        let flippedImage = flipImageHorizontally(image: image!)
        let imageView = UIImageView(image: flippedImage)
        imageView.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
        self.view.addSubview(imageView)
    }
    
    func flipImageHorizontally(image: UIImage) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale)
        let context = UIGraphicsGetCurrentContext()!
        context.translateBy(x: image.size.width, y: 0)
        context.scaleBy(x: -1, y: 1)
        image.draw(at: CGPoint.zero)
        let flippedImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return flippedImage
    }
}