How to take a screenshot in my app iOS swift

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Solution:
func snapshot(of rect: CGRect? = nil) -> UIImage? {
        // snapshot entire view
        
        UIGraphicsBeginImageContextWithOptions(bounds.size, isOpaque, 0)
        drawHierarchy(in: bounds, afterScreenUpdates: true)
        let wholeImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        // if no `rect` provided, return image of whole view
        
        guard let image = wholeImage, let rect = rect else { return wholeImage }
        
        // otherwise, grab specified `rect` of image
        
        let scale = image.scale
        let scaledRect = CGRect(x: rect.origin.x * scale, y: rect.origin.y * scale, width: rect.size.width * scale, height: rect.size.height * scale)
        guard let cgImage = image.cgImage?.cropping(to: scaledRect) else { return nil }
        return UIImage(cgImage: cgImage, scale: scale, orientation: .up)
    }


The above function will be most usefull for taking screenshot inside the app.

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