Getting an error.
CGPathAddPath is unavailable: Use addPath(_:transform) Using Xcode 8.0
for index in 0...(chars.count - 1)
{
let letter = CTFontCreatePathForGlyph(borderFont, glyphs[index], nil)
var t = CGAffineTransform(translationX: xPosition , y: 0)
CGPathAddPath(letters, &t, letter)
xPosition = xPosition + advances[index].width
}