在UIPinchGestureRecognizer放大和缩小后获取原始图像大小

import UIKit

let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(handlePinchGesture(_:)))
yourImageView.addGestureRecognizer(pinchGesture)

@objc func handlePinchGesture(_ gesture: UIPinchGestureRecognizer) {
    if gesture.state == .ended {
        let originalSize = yourImageView.image?.size
        print("原始图像大小：\(originalSize)")
    }
}