This is the Swift translation of the Apple's code snippet (https://developer.apple.com/library/mac/qa/qa1487/_index.html) displaying how to embed hyperlinks in NSTextField and NSTextView.

NSAttributedString+Hyperlink.swift

import AppKit

extension NSAttributedString {
    class func hyperlinkFromString(aString: String, withURL url: NSURL) -> NSAttributedString {
        let attrString = NSMutableAttributedString(string: aString)
        let range = NSMakeRange(0, attrString.length)
        
        attrString.beginEditing()
        attrString.addAttribute(NSLinkAttributeName, value: url.absoluteString, range: range)
        attrString.addAttribute(NSForegroundColorAttributeName, value: NSColor.blueColor(), range: range)
        attrString.addAttribute(NSUnderlineStyleAttributeName, value: NSNumber(integer: NSUnderlineStyle.StyleSingle.rawValue), range: range)
        attrString.endEditing()
        
        return attrString
    }
}