let textStorage = NSTextStorage(attributedString: attributedString)
let layoutManager = NSLayoutManager()
layoutManager.usesFontLeading = true
textStorage.addLayoutManager(layoutManager)

let textContainer = NSTextContainer(size: containerSize)
layoutManager.addTextContainer(textContainer)

textContainer.lineFragmentPadding = 0.0

layoutManager.ensureLayoutForTextContainer(textContainer)

let tappedIndex = layoutManager.characterIndexForPoint(point,
        inTextContainer: textContainer,
        fractionOfDistanceBetweenInsertionPoints: nil)

let emojiText = "😀"
let font = UIFont.systemFontOfSize(20.0)
let containerSize = CGSize(width: 300.0, height: 20000.0)

let attributedString = NSAttributedString(string: emojiText, attributes: [NSFontAttributeName: font])

let textStorage = NSTextStorage(attributedString: attributedString)
let layoutManager = NSLayoutManager()
layoutManager.usesFontLeading = true
textStorage.addLayoutManager(layoutManager)

let textContainer = NSTextContainer(size: containerSize)
layoutManager.addTextContainer(textContainer)
textContainer.lineFragmentPadding = 0.0

layoutManager.ensureLayoutForTextContainer(textContainer)

let glyphRect = layoutManager.boundingRectForGlyphRange(NSRange(location: 0, length: attributedString.length), inTextContainer: textContainer)
let boundingRect = attributedString.boundingRectWithSize(containerSize, options:[.UsesLineFragmentOrigin, .UsesFontLeading], context: nil)

glyphRect = (0.0, 0.0, 23.0, 28.875)
boundingRect = (0.0, 0.0, 23.0, 23.8671875)