Is it possible to set custom font & size for NSString?

Question

I\'m working with Swift in iOS 9. I want to customize the font for a UIAlertAction. I searched these questions for a Swift answer:

Change the Font of UI

Answer 1

You would use NSAttributedString (or its mutable counterpart, NSMutableAttributedString) to make a string with custom info. As the constructor takes an NSString (or String in Swift), it will not take an NSAttributedString (NSAttributedString isn't a subclass of NSString.).

You could fudge the Swift compiler into passing an NSAttributedString using unsafeBitCast, but UIAlertAction may not like it.

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Looking at UIAlertController custom font, size, color, it seems that you can set it using KVO. The code for doing of so is similar:

var alertVC = UIAlertController(title: "Dont care what goes here, since we're about to change below", message: "", preferredStyle: .ActionSheet)
let hogan = NSMutableAttributedString(string: "Presenting the great... Hulk Hogan!")
hogan.addAttribute(NSFontAttributeName, value: UIFont.systemFontOfSize(50), range: NSMakeRange(24, 11))

alertVC.setValue(hogan, forKey: "attributedTitle")