代码如下

class ZoomView: UIImageView {
    
    var Drag: UIPanGestureRecognizer!
    var Rotate: UIRotationGestureRecognizer!
    var Scale: UIPinchGestureRecognizer!

    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        backgroundColor = .red
        
        Drag = UIPanGestureRecognizer(target: self, action: #selector(onDrag(gesture:)))
        Rotate = UIRotationGestureRecognizer(target: self, action: #selector(onRotate(gesture:)))
        Scale = UIPinchGestureRecognizer(target: self, action: #selector(onScale(gesture:)))

        addGestureRecognizer(Drag)
        addGestureRecognizer(Rotate)
        addGestureRecognizer(Scale)

    }
    
    //拖拽手势方法具体实现
    @objc func onDrag(gesture: UIPanGestureRecognizer) {
        let translation = gesture.translation(in: self.superview)
        var center = gesture.view!.center
        center.x += translation.x
        center.y += translation.y
        gesture.view!.center = center
        gesture.setTranslation(CGPoint.zero, in: self.superview)
    }
    //旋转手势方法具体实现
    @objc func onRotate(gesture: UIRotationGestureRecognizer?) {
        if let transform = gesture?.view?.transform.rotated(by: gesture?.rotation ?? 0.0) {
            gesture?.view?.transform = transform
        }
        gesture?.rotation = 0
    }
    //缩放手势方法具体实现
    @objc func onScale(gesture: UIPinchGestureRecognizer?) {
        if let transform = gesture?.view?.transform.scaledBy(x: gesture?.scale ?? 0.0, y: gesture?.scale ?? 0.0) {
            gesture?.view?.transform = transform
        }
        gesture?.scale = 1
    }
    
}