AttributedText in TextView while typing [duplicate] - ios

Question

This question already has answers here:
Replace UITextViews text with attributed string
(4 answers)
Closed 6 years ago.
I have a textView, and I am trying to give it an attributed text. I tried achieving it inside shouldChangeTextInRange, but it crashes for range out of index.
func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
if myTextView {
textView.attributedText = addAttributedText(1, text: text, fontsize: 13)
let newText = (textView.text as NSString).stringByReplacingCharactersInRange(range, withString: text)
let numberOfChars = newText.characters.count
return numberOfChars < 20
}
return true
}
func addAttributedText(spacing:CGFloat, text:String, fontsize: CGFloat) -> NSMutableAttributedString {
let attributedString = NSMutableAttributedString(string: text, attributes: [NSFontAttributeName:UIFont(
name: "Font",
size: fontsize)!])
attributedString.addAttribute(NSKernAttributeName, value: spacing, range: NSMakeRange(0, text.characters.count))
return attributedString
}
I tried adding attributedString with empty text to textView in viewDidLoad, but that doesn't help. That's why I thought it would be appropriate to do it on shouldChangeTextInRange
(Please note that my addAttributedText method works perfectly for other textviews)
If I use this, in one character type-in, it writes 2x and crashes. What is the right way of handling that kind of converting textView's text to attributed text that is being typed.

Answer 1

Here is the code that I tried to convert from the link above, it might have bugs, but I hope it will be able to help you.
func formatTextInTextView(textView: UITextView)
{
textView.scrollEnabled = false
var selectedRange: NSRange = textView.selectedRange
var text: String = textView.text!
// This will give me an attributedString with the base text-style
var attributedString: NSMutableAttributedString = NSMutableAttributedString(string: text)
var error: NSError? = nil
var regex: NSRegularExpression = NSRegularExpression.regularExpressionWithPattern("#(\\w+)", options: 0, error: error!)
var matches: [AnyObject] = regex.matchesInString(text, options: 0, range: NSMakeRange(0, text.length))
for match: NSTextCheckingResult in matches {
var matchRange: NSRange = match.rangeAtIndex(0)
attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: matchRange)
}
textView.attributedText = attributedString
textView.selectedRange = selectedRange
textView.scrollEnabled = true
}
EDIT: didn't see that in the original post there was a Swift answer, here is the link: stackoverflow.com/a/35842523/1226963