NSTextView：替换所有选项卡

Question

I have a NSTextView where I would like to use spaces instead of tabs. I though I would replaceOccurrencesOfString:withString:options:range: in textStorageWillProcessEditing: of my textview delegate but it doesn't work (undo breaks).

Please, does anyone know how to implement such functionality? Is there other way of doing it?

Edit: this is what I have in the textStorageWillProcessEditing: method:

ts = [notification object];
[[ts mutableString] replaceOccurrencesOfString:@"\t"
                                    withString:@"  "
                                       options:NSLiteralSearch
                                         range:[ts editedRange]];

Answer 1

You could override the the keyUp: method. If the event.keyCode == keycodefortabwhichidontknow :) then you could insert four spaces.

And if else, of course just call [super keyDown:theEvent];