2

I have an NSMutatableString:

var string: String = "Due in %@ (%@) $%@.\nOverdue! Please pay now %@"
attributedText = NSMutableAttributedString(string: string, attributes: attributes)

How to calculate both the length and starting index from the word Overdue in swift?

so far I have tried:

let startIndex = attributedText.string.rangeOfString("Overdue")
let range = startIndex..<attributedText.string.finishIndex

// Access the substring.
let substring = value[range]
print(substring)

But it doesn't work.

Ozgur Vatansever
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kevinabraham
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2 Answers2

6

You should generate the resulting string first:

let string = String(format: "Due in %@ (%@) $%@.\nOverdue! Please pay now %@", "some date", "something", "15", "some date")

Then use .disTanceTo to get the distance between indices;

if let range = string.rangeOfString("Overdue") {
  let start = string.startIndex.distanceTo(range.startIndex)
  let length = range.startIndex.distanceTo(string.endIndex)

  let wordToEndRange = NSRange(location: start, length: length) 
  // This is the range you need

  attributedText.addAttribute(NSForegroundColorAttributeName, 
     value: UIColor.blueColor(), range: wordToEndRange)
}

enter image description here

Please do note that NSRange does not work correctly if the string contains Emojis or other Unicode characters so that the above solution may not work properly for that case.

Please look at the following SO answers for a better solution which cover that case as well:

Community
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Ozgur Vatansever
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    Genius. Solved 2 of my problems by adding the color. Thank you so much @ozgur! Wish I could double up vote. – kevinabraham Sep 06 '16 at 05:19
  • This conversion of string indices to NSRange does *not* work correctly if the string contains Emojis or other Unicode characters > U+FFFF. Compare http://stackoverflow.com/questions/27880650/swift-extract-regex-matches and http://stackoverflow.com/questions/27040924/nsrange-from-swift-range for similar issues. – You can try it with `let string = " Bla bla Overdue! bla bla"` – Martin R Sep 06 '16 at 06:13
0

Look at this,

                let nsString = element.text as NSString
                let range = nsString.range(of: word, options: .widthInsensitive)
                let att: [NSAttributedString.Key: Any] = [.foregroundColor: UIColor.systemBlue]
                attText.addAttributes(att, range: NSRange(location: range.location, length: range.length))
Mahadev Prabhu
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