如何解释触控板捏合手势以缩放IKImageBrowserView

class ViewController: UIViewController, IKImageBrowserViewDelegate {
    var imageBrowserView: IKImageBrowserView!
    var pinchGestureRecognizer: UIPinchGestureRecognizer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 初始化IKImageBrowserView
        imageBrowserView = IKImageBrowserView(frame: view.bounds)
        imageBrowserView.delegate = self
        view.addSubview(imageBrowserView)
        
        // 添加触控板捏合手势识别器
        pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(handlePinchGesture(_:)))
        view.addGestureRecognizer(pinchGestureRecognizer)
    }
    
    @objc func handlePinchGesture(_ sender: UIPinchGestureRecognizer) {
        switch sender.state {
        case .began:
            // 记录当前图像的缩放比例和位置
            break
        case .changed:
            // 根据识别器的缩放比例和位置来更新图像的缩放比例和位置
            break
        case .ended, .cancelled:
            // 更新图像的缩放比例和位置，并将其保存到数据模型中
            break
        default:
            break
        }
    }
}