Saving an image on top of another image in Swift

Question

I am learning Swift and I am creating an app that uses a personal photo and puts another on top of it. I now have a hacky solution, to create a screenshot of the area and save it. I need to do this in Swift

@IBAction func saveImage(sender: AnyObject) {
    //Create the UIImage
    UIGraphicsBeginImageContext(imageView.frame.size)
    view.layer.renderInContext(UIGraphicsGetCurrentContext())
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    //Save it to the camera roll
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}

But, this was working and isn't anymore. But, this is also not the best solution.

So guys, how can I save an image to the camera roll from a personal image, with an image as overlay?

Help would be greatly appreciated!! Thanks!

Answer 1

I would recommend reading through this thread. All your answers are there. Once you read through that article, the following code sample should help you composite the two images together properly.

func saveImage() {
    let bottomImage = UIImage(named: "bottom")!
    let topImage = UIImage(named: "top")!

    let newSize = CGSizeMake(100, 100) // set this to what you need
    UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0)

    bottomImage.drawInRect(CGRect(origin: CGPointZero, size: newSize))
    topImage.drawInRect(CGRect(origin: CGPointZero, size: newSize))

    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
}

Hopefully this gets you going in the right direction.