Cut a UIImage into a circle

Question

I want to cut a UIImage into a circle so that I can then use it as an annotation. Every answer on this site that I\'ve found describes creating an UIImage

Answer 1

swift 3 conform to MVC pattern create an external file

@IBDesignable
class RoundImage: UIImageView{


@IBInspectable var cornerRadius: CGFloat = 0 {
    didSet{
        self.layer.cornerRadius = cornerRadius
    }
}

// set border width
@IBInspectable var borderWidth: CGFloat = 0 {
    didSet{
        self.layer.borderWidth = borderWidth
    }
}

// set border color

@IBInspectable var borderColor: UIColor = UIColor.clear {
    didSet{
        self.layer.borderColor = borderColor.cgColor
    }
}

override func awakeFromNib() {
    self.clipsToBounds = true
}


}// class

call class in the IB on storyboard

set cornerradius as you please (1/2 of width if desire circle)

Done!