How to take screenshot of portion of UIView?

Question

I want the user to go on my app and take a screenshot of the app after pressing a button programmatically in Swift. I know that UIGraphicsGetImageFromCurrentImageConte

Answer 1

This is a previously asked question at How to capture UIView to UIImage without loss of quality on retina display but to expand in swift (2.3):

extension UIView {

    class func image(view: UIView) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0)
        guard let ctx = UIGraphicsGetCurrentContext() else {
            return nil
        }
        view.layer.renderInContext(ctx)
        let img = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return img
    }

    func image() -> UIImage? {
        return UIView.image(self)
    }
}

So you can either get an image from a view with UIView.image(theView) or by asking the view itself let viewImage = self.view.image()

Do bear in mind though that this is rough and probably needs further looking at for thread safety etc....