TextKit2: Relation between NSRange and NSTextRange

Question

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

1.3k

Posted by

krzyzanowskim

Reply

Add a Comment

Answer 1

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)

Posted by

Frank_O

Add a Comment

Answer 2

Found a better way yet? Having the same problem.

Posted by

eaigner

Add a Comment

Answer 3

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)
  }
}

Posted by

josevillegas

Add a Comment

Answer 4

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)
  }
}

Posted by

josevillegas

Add a Comment

TextKit2: Relation between NSRange and NSTextRange

Replies