Add border to UIImage inside of a UITextView - ios

Question

I am trying to add a border to a UIImage I have, not UIImageView.
Here is my code:
let textView = UITextView(frame: CGRectMake(10, 20, self.view.frame.width - 20, self.view.frame.height - 20))
let attributedString = NSMutableAttributedString(string: "")
let image1 = NSTextAttachment()
image1.image = UIImage(named: "image.jpg")
let oldWidth1 = image1.image!.size.width;
//I'm subtracting 10px to make the image display nicely, accounting
//for the padding inside the textView
let scaleFactor1 = oldWidth1 / (textView.frame.size.width - 10 )
image1.image = UIImage(CGImage: image1.image!.CGImage!, scale: scaleFactor1, orientation: .Up)
let attrStringWithImage1 = NSAttributedString(attachment: image1)
attributedString.replaceCharactersInRange(NSMakeRange(0, 0), withAttributedString: attrStringWithImage1)
textView.attributedText = attributedString;
self.view.addSubview(textView)
I have that UIImage which is displaying nicely in a textView, but now I would like to add a border or some padding to the image so that the text is not so close to the image!

Answer 1

You could easily use Core Graphics to do this
You just have to re-draw the image in a bigger context to account for the border width – and offset the image by the border width.
Something like this should do the trick:
extension UIImage {
func imageWithBorder(borderWidth:CGFloat) -> UIImage {
// the bigger size to account for the border width
let newSize = CGSize(width: size.width+borderWidth*2.0, height: size.height+borderWidth*2.0)
// create new image context
UIGraphicsBeginImageContextWithOptions(newSize, false, scale)
// draw image with offset of the border width
self.drawInRect(CGRect(x: borderWidth, y: borderWidth, width: size.width, height: size.height))
// get image and end context
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img
}
}
If you want to give the border a fill color, you can always do that by setting the fill color, and filling the context before drawing the image.
You can then use it like this:
image1.image = UIImage(named: "image.jpg")?.imageWithBorder(10)
Side Note
You seem to be force unwrapping optionals quite a bit. Please don't. Please always safely unwrap them. My answer here might be useful for that.