TextKit2: Relation between NSRange and NSTextRange

Question

Created Nov ’21

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The way NSTextView is built it's inevitable to use NSTextStorage with TextKit2, however the NSAttributedString uses NSRange vs the TextKit2 family uses NSTextRange for text location, etc. What I struggle with is the relation between these two. I didn't find a convenient translation between these two. Is NSAttributedStrint NSRange length=1 equal to NSTextRange offset 1? I think it's not (at least it's not necessarily true for every NSTextContentManager.

So my question is, given a NSTextRange, what is the corresponding NSRange in NSTextContentStorage.attributedString

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Answer 1

Frank_O OP

Nov ’21

I figured out a clumsy way to convert NSTextRange to NSRange, of cause by researching the development documents for ages.

let offset = textContentStorage!.offset(from: textLayoutManager!.documentRange.location, to: textRange.location)
let length = textContentStorage!.offset(from: textRange.location, to: textRange.endLocation)
let nsRange = NSRange(location: offset, length: length)

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Answer 2

eaigner OP

Mar ’24

Found a better way yet? Having the same problem.

0

Answer 3

josevillegas OP

Apr ’24

extension NSRange {
  init?(textRange: NSTextRange, in contentManager: NSTextContentManager) {
    let location = contentManager.offset(from: contentManager.documentRange.location, to: textRange.location)
    let length = contentManager.offset(from: textRange.location, to: textRange.endLocation)
    if location == NSNotFound || length == NSNotFound { return nil }
    self.init(location: location, length: length)
  }
}

extension NSTextRange {
  convenience init?(range: NSRange, in contentManager: NSTextContentManager) {
    guard let location = contentManager.location(contentManager.documentRange.location, offsetBy: range.location),
          let endLocation = contentManager.location(location, offsetBy: range.length) else { return nil }
    self.init(location: location, end: endLocation)
  }
}

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Answer 4

josevillegas OP

Apr ’24

Or you could extend NSTextContentManager:

extension NSTextContentManager {
  func range(for textRange: NSTextRange) -> NSRange? {
    let location = offset(from: documentRange.location, to: textRange.location)
    let length = offset(from: textRange.location, to: textRange.endLocation)
    if location == NSNotFound || length == NSNotFound { return nil }
    return NSRange(location: location, length: length)
  }

  func textRange(for range: NSRange) -> NSTextRange? {
    guard let textRangeLocation = location(documentRange.location, offsetBy: range.location),
          let endLocation = location(textRangeLocation, offsetBy: range.length) else { return nil }
    return NSTextRange(location: textRangeLocation, end: endLocation)
  }
}

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