How to convert character index from layoutManager to String scale in swift?
this is the code I'm using:

```
let touchPoint: CGPoint = gesture.locationOfTouch(0, inView: self.definitionLabel)
let index = layoutManager.characterIndexForPoint(touchPoint, inTextContainer: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)

```

please don't tell me to use `advanceBy()` function on the first index of the string characterset since characters like ò count two in the scale of layoutManager but swift string counts theme once.