Add NSUnderlineStyle.PatternDash to NSAttributedString in Swift?

Turns out I needed the toRaw() method - this works:

text.addAttribute(NSUnderlineStyleAttributeName, value: NSNumber(integer:(NSUnderlineStyle.StyleDouble).toRaw()), range: NSMakeRange(0, text.length))

Here's a full example of creating a UILabel with underlined text:

Swift 5:

let homeLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 30))

let text = NSMutableAttributedString(string: "hello, world!")

let attrs = [NSAttributedString.Key.underlineStyle: NSUnderlineStyle.patternDash.rawValue | NSUnderlineStyle.single.rawValue]

text.addAttributes(attrs, range: NSRange(location: 0, length: text.length))

homeLabel.attributedText = text

---

Swift 4:

let homeLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 30))

let text = NSMutableAttributedString(string: "hello, world!")

let attrs = [NSAttributedStringKey.underlineStyle: NSUnderlineStyle.patternDash.rawValue | NSUnderlineStyle.styleSingle.rawValue]

text.addAttributes(attrs, range: NSRange(location: 0, length: text.length))

homeLabel.attributedText = text

---

Swift 2:

Swift allows you to pass an Int to a method that takes an NSNumber, so you can make this a little cleaner by removing the conversion to NSNumber:

text.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleDouble.rawValue, range: NSMakeRange(0, text.length))

Note: This answer previously used toRaw() as used in the original question, but that is now incorrect as toRaw() has been replaced by the property rawValue as of Xcode 6.1.

In Xcode 6.1, SDK iOS 8.1 toRaw() has been replaced by rawValue:

 text.addAttribute(NSUnderlineStyleAttributeName, value:  NSUnderlineStyle.StyleDouble.rawValue, range: NSMakeRange(0, text.length))

Or Easier :

 var text : NSAttributedString = NSMutableAttributedString(string: str, attributes : [NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleSingle.rawValue]) 

If you want an actual dashed line, you should OR | the raw values of both PatternDash and StyleSingle enums like below:

let dashed     =  NSUnderlineStyle.PatternDash.rawValue | NSUnderlineStyle.StyleSingle.rawValue

let attribs    = [NSUnderlineStyleAttributeName : dashed, NSUnderlineColorAttributeName : UIColor.whiteColor()];

let attrString =  NSAttributedString(string: plainText, attributes: attribs)