how to add colored border to uiimage in swift

Question

It is pretty easy to add border to UIImageView, using layers (borderWidth, borderColor etc.). Is there any possibility to add border to image, not to image view? Does somebo

Answer 1

Here is the way how you can achieve that:

Add below extension to your code:

extension UIImage {
    func imageWithBorder(width: CGFloat, color: UIColor) -> UIImage? {
        let square = CGSize(width: min(size.width, size.height) + width * 2, height: min(size.width, size.height) + width * 2)
        let imageView = UIImageView(frame: CGRect(origin: CGPoint(x: 0, y: 0), size: square))
        imageView.contentMode = .center
        imageView.image = self
        imageView.layer.borderWidth = width
        imageView.layer.borderColor = color.cgColor
        UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
        guard let context = UIGraphicsGetCurrentContext() else { return nil }
        imageView.layer.render(in: context)
        let result = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return result
    }
}

And you can use it this way:

let imgOriginal = UIImage.init(named: "Richie_Rich")
img.image = imgOriginal?.imageWithBorder(width: 2, color: UIColor.blue)

And result will be:

Here is the original post which is with Round corners but I removed that code because you did't ask for it.