[Swift5] スクリーンショットを保存

    var screenShotImage = UIImage()
    func takeScreenShot(){
        let width = CGFloat(UIScreen.main.bounds.size.width)
        let height = CGFloat(UIScreen.main.bounds.size.height)
        let size = CGSize(width: width, height: height)

        UIGraphicsBeginImageContextWithOptions(size, false, 0.0)

        //viewに書き出す
        self.view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)
        screenShotImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
    }