how to crop image in swift 3.0

cropImage.swift

extension UIView
{
    func getCropedImage(frame: CGRect) -> UIImage
    {
        UIGraphicsBeginImageContextWithOptions(frame.size, false, 0)
        drawHierarchy(in: CGRect(x: -frame.origin.x, y:-frame.origin.y, width: self.bounds.size.width, height: self.bounds.size.height), afterScreenUpdates: true)
        let snapshotImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return snapshotImage
    }
}

// FullImage.image = FullView.getCropedImage(frame: CropView.frame)