nstextstorage

I've got an NSTextView subclass acting as its NSTextStorage delegate. I'm trying to do 2 things: Highlight the text in some ways Evaluate the text and then append the answer to the textview. I'm doing this in two different methods, both invoked by the - (void)textStorageWillProcessEditing:(NSNotification *)notification delegate callback. I can do the syntax highlighting just fine, but when it comes to appending my answer, the insertion point jumps to the end of the line and I don't really know why. My evaluate method looks like the following: NSString *result = ..; NSRange lineRange = [

In order to break another problem down into smaller parts, I am trying to set up all the TextKit components. However, I am getting an crash after changing how I initialize NSTextStorage . For testing purposes I have simplified the project to the following: import UIKit class ViewController3: UIViewController { @IBOutlet weak var textView: UITextView! @IBOutlet weak var myTextView: MyTextView! override func viewDidLoad() { super.viewDidLoad() let container = NSTextContainer(size: myTextView.bounds.size) let layoutManager = NSLayoutManager() let textStorage = NSTextStorage(string: "This is a