Create snapshot using drawHierarchy() to include child views

UIView+Ext.swift

//
//  UIView+Ext.swift
//  tahrir
//
//  Created by Maysam Shahsavari on 9/14/19.
//  Copyright © 2019 Maysam Shahsavari. All rights reserved.
//

import Foundation
import UIKit

extension UIView {
    func snapshot() -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(bounds.size, false, 0.0)
        drawHierarchy(in: CGRect(origin: CGPoint.zero, size: bounds.size), afterScreenUpdates: true)
        if let image = UIGraphicsGetImageFromCurrentImageContext() {
            UIGraphicsEndImageContext()
            return image
        }else{
            return nil
        }
    }
}