Calculate range of string from word to end of string in swift

Question

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.

Community · Accepted Answer · 2017-05-23 10:30:42Z

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)
}

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:

edited May 23, 2017 at 10:30

CommunityBot

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answered Sep 6, 2016 at 5:01

Ozgur Vatansever

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2 Comments

kevinabraham Over a year ago

Genius. Solved 2 of my problems by adding the color. Thank you so much @ozgur! Wish I could double up vote.

Martin R Over a year ago

This conversion of string indices to NSRange does not work correctly if the string contains Emojis or other Unicode characters > U+FFFF. Compare stackoverflow.com/questions/27880650/… and stackoverflow.com/questions/27040924/nsrange-from-swift-range for similar issues. – You can try it with let string = "😀😀😀 Bla bla Overdue! bla bla"

Mahadev Prabhu · Accepted Answer · 2021-07-01 08:25:49Z

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))

answered Jul 1, 2021 at 8:25

Mahadev Prabhu

1

1 Comment

Tyler2P Over a year ago

Please add some explanation. Why do you think your proposed solution might help the OP.

Ahmadreza · Accepted Answer · 2024-03-07 18:18:32Z

0

Base of the Mahadev Prabhu's answer:

extension String {
    func getRange(of word: String)-> NSRange {
        return (self as NSString).range(of: word, options: .widthInsensitive)
    }
}

answered Mar 7, 2024 at 18:18

Ahmadreza

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