Outline UILabel text in UILabel Subclass

Question

I\'m trying hard to find a way to simply add an outline/stroke/contour to my UILabel text. Talking about a stroke around the letters of the text not around the background of

Answer 1

@anandnimje answer converted to Swift 4.2 and wrapped it into a function:

public func stroke(font: UIFont, strokeWidth: Float, insideColor: UIColor, strokeColor: UIColor) -> [NSAttributedStringKey: Any]{
    return [
        NSAttributedStringKey.strokeColor : strokeColor,
        NSAttributedStringKey.foregroundColor : insideColor,
        NSAttributedStringKey.strokeWidth : -strokeWidth,
        NSAttributedStringKey.font : font
        ]
}

Usage:

label.attributedText = NSMutableAttributedString(string: "Hello World", 
attributes: stroke(font: UIFont(name: "SourceSansPro-Black", size: 20)!, 
strokeWidth: 4, insideColor: .white, strokeColor: .black))

Make sure you have the right name for your UIFont, else it crashes. Should never be a problem if you have the right name.