Taking a screenshot and adding a text/watermark on top in Swift - ios

Question

Im trying to allow the ability for a user to share a screenshot of an App and share it. I have got the taking of a screenshot and sharing but was interested in finding out if anyone knew how to add a layer of text on top of that screenshot when it is being taken, kind of like a watermark.
Here I take the screenshot:
let layer = UIApplication.sharedApplication().keyWindow!.layer
let scale = UIScreen.mainScreen().scale
UIGraphicsBeginImageContextWithOptions(layer.frame.size, false, scale);
layer.renderInContext(UIGraphicsGetCurrentContext()!)
let screenshot = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let croppedImage = self.cropImage(screenshot)
let activityViewController = UIActivityViewController(activityItems: [croppedImage], applicationActivities: nil)
self.presentViewController(activityViewController, animated: true, completion: nil)
I crop the screenshot image in this function so it just shows middle of screen:
func cropImage(screenshot: UIImage) -> UIImage {
let scale = screenshot.scale
let imgSize = screenshot.size
let screenHeight = UIScreen.mainScreen().bounds.height
let bound = self.view.bounds.height
let navHeight = self.navigationController!.navigationBar.frame.height
let bottomBarHeight = screenHeight - navHeight - bound
let crop = CGRectMake(0, 200, //"start" at the upper-left corner
(imgSize.width - 1) * scale, //include half the width of the whole screen
(imgSize.height - bottomBarHeight - 300) * scale) //include the height of the navigationBar and the height of view
let cgImage = CGImageCreateWithImageInRect(screenshot.CGImage, crop)
let image: UIImage = UIImage(CGImage: cgImage!)
return image
}

Answer 1

Yes it is possible to do that. Try adding subview to your image view like below
let newImageView = UIImageView(image : croppedImage)
let labelView = UILabel(frame: CGRectMake(30, 30, 100, 20)) //adjust frame to change position of water mark or text
labelView.text = "my text"
newImageView.addSubview(labelView)
UIGraphicsBeginImageContext(newImageView.frame.size)
newImageView.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let watermarkedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()