how to resize an image or done as a NSAttributedString NSTextAttachment (or set its initital size)

Question

I have a NSAttributedString to which I am adding a NSTextAttachment. The image is 50w by 50h but I\'d like it to scale down to reflect the line height of the attributed stri

Answer 1

If you need to resize a bunch of NSTextAttachment images while keeping their aspect ratio i've written a handy extension: http://hack.swic.name/convenient-nstextattachment-image-resizing

extension NSTextAttachment {
    func setImageHeight(height: CGFloat) {
        guard let image = image else { return }
        let ratio = image.size.width / image.size.height

        bounds = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: ratio * height, height: height)
    }
}

Example usage:

let textAttachment = NSTextAttachment()
textAttachment.image = UIImage(named: "Image")
textAttachment.setImageHeight(16) // Whatever you need to match your font

let imageString = NSAttributedString(attachment: textAttachment)
yourAttributedString.appendAttributedString(imageString)