issue with title in navigation bar in arabic - ios

Question

I am having an issue with this function:
func setTitle(title:String, subtitle:String) -> UIView {
let titleLabel = UILabel(frame: CGRect(x:0, y:-5, width:0, height:0))
titleLabel.backgroundColor = UIColor.clear
titleLabel.textColor = UIColor.gray
titleLabel.font = UIFont.boldSystemFont(ofSize: 17)
titleLabel.text = title
titleLabel.sizeToFit()
let subtitleLabel = UILabel(frame: CGRect(x:0, y:18, width:0, height:0))
subtitleLabel.backgroundColor = UIColor.clear
subtitleLabel.textColor = UIColor.black
subtitleLabel.font = UIFont.systemFont(ofSize: 12)
subtitleLabel.text = subtitle
subtitleLabel.sizeToFit()
let titleView = UIView(frame: CGRect(x:0, y:0, width:max(titleLabel.frame.size.width, subtitleLabel.frame.size.width), height:30))
titleView.addSubview(titleLabel)
titleView.addSubview(subtitleLabel)
let widthDiff = subtitleLabel.frame.size.width - titleLabel.frame.size.width
if widthDiff > 0 {
var frame = titleLabel.frame
frame.origin.x = widthDiff / 2
titleLabel.frame = frame.integral
} else {
var frame = subtitleLabel.frame
frame.origin.x = abs(widthDiff) / 2
titleLabel.frame = frame.integral
}
return titleView
}
// Use :
self.navigationItem.titleView = setTitle("title", "subtitle")
// Source : http://stackoverflow.com/questions/12914004/uinavigationbar-titleview-with-subtitle
as shown above images, whenever someone writes in arabic[picture 2] the title will be messed up, but if someone wrote it in English[picture 1]. the label of title will remain good.
thank you in advance.

Answer 1

I ran code with all combinations of arabic and english words and found the problem in code. Check it out.
if widthDiff > 0 {
var frame = titleLabel.frame
frame.origin.x = widthDiff / 2
titleLabel.frame = frame.integral
} else {
var frame = subtitleLabel.frame
frame.origin.x = abs(widthDiff) / 2
titleLabel.frame = frame.integral /* subtitleLabel.frame = frame.integral */
}