How to implement undo/redo with programatic change of the textValue of a NSTextView?

Question

I created a simple demo app with a NSTextView and a button, the provided a NSTextViewDelegate to the textView and added an action:

- (IBAction)actionButtonClicke         


        

Answer 1

-setString: is an inherited method from NSText. To handle this using NSTextView methods only so that undo is handled, just do this:

[self.textView setSelectedRange:NSMakeRange(0, [[self.textView textStorage] length])];
[self.textView insertText:@"And… ACTION!"];

Making the text change this way avoids mucking about with the undo manager at all.