didPinchView.swift

@objc func didPinchView(gestureRecognizer: UIPinchGestureRecognizer) {
    if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
        guard let transform = gestureRecognizer.view?.transform else { return }
        let scale = gestureRecognizer.scale
        gestureRecognizer.view?.transform = transform.scaledBy(x: scale, y: scale)
        gestureRecognizer.scale = 1.0
    }
}