What's new in TextKit and text views

13:21 - Check for NSTextLayoutManager first

if let textLayoutManager = textView.textLayoutManager {
    // TextKit 2 code goes here
}
else {
    let layoutManager = textView.layoutManager    
    // TextKit 1 code goes here
}

17:41 - Counting number of lines of wrapped text in a text view with TextKit 2

// Example: Updating glyph-based code 

var numberOfLines = 0
let textLayoutManager = textView.textLayoutManager

textLayoutManager.enumerateTextLayoutFragments(from:
                                               textLayoutManager.documentRange.location,
                                               options: [.ensuresLayout]) { layoutFragment in
        numberOfLines += layoutFragment.textLineFragments.count
}

21:10 - Convert NSRange to NSTextRange

let textContentManager = textLayoutManager.textContentManager

let startLocation = textContentManager.location(textContentManager.documentRange.location, 
                                                offsetBy: nsRange.location)!

let endLocation = textContentManager.location(startLocation, 
                                              offsetBy: nsRange.length)

let nsTextRange = NSTextRange(location: startLocation, end: endLocation)

21:40 - Convert NSTextRange to NSRange

let textContentManager = textLayoutManager.textContentManager

let location = textContentManager.offset(from: textContentManager.documentRange.location,
                                         to: nsTextRange!.location)

let length = textContentManager.offset(from: nsTextRange!.location,
                                       to: nsTextRange!.endLocation)

let nsRange = NSRange(location: location, length: length)

22:02 - Convert UITextRange to NSTextRange

let offset = textView.offset(from: textview.beginningOfDocument, to: uiTextRange.start)

let startLocation = textContentManager.location(textContentManager.documentRange.location, 
                                                offsetBy: offset)!

let nsTextRange = NSTextRange(location: startLocation)