iOS:如何很好地放大图像？

import UIKit

class ViewController: UIViewController, UIGestureRecognizerDelegate {
    @IBOutlet weak var imageView: UIImageView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置要放大的图像
        imageView.image = UIImage(named: "image.jpg")
        
        // 设置contentMode为UIViewContentModeScaleAspectFit
        imageView.contentMode = .scaleAspectFit
        
        // 添加双击手势识别器
        let doubleTapGesture = UITapGestureRecognizer(target: self, action: #selector(handleDoubleTap(_:)))
        doubleTapGesture.numberOfTapsRequired = 2
        doubleTapGesture.delegate = self
        imageView.addGestureRecognizer(doubleTapGesture)
        
        // 允许用户交互
        imageView.isUserInteractionEnabled = true
    }
    
    @objc func handleDoubleTap(_ gesture: UITapGestureRecognizer) {
        // 获取当前缩放比例
        let currentScale = imageView.frame.size.width / imageView.bounds.size.width
        
        // 设置放大比例
        let zoomScale = currentScale < 1 ? 2 : 1
        
        // 计算新的frame
        let newWidth = imageView.frame.size.width * zoomScale
        let newHeight = imageView.frame.size.height * zoomScale
        let newX = imageView.frame.origin.x - (newWidth - imageView.frame.size.width) / 2
        let newY = imageView.frame.origin.y - (newHeight - imageView.frame.size.height) / 2
        let newFrame = CGRect(x: newX, y: newY, width: newWidth, height: newHeight)
        
        // 执行放大动画
        UIView.animate(withDuration: 0.3) {
            self.imageView.frame = newFrame
        }
    }
}