如何将自定义NSFormatter设置为NSTextView？

Question

I have a NSTextView and i have a custom NSFormatter that limits the string length. But how do i " [_textView setFormatter:customFormatter] " on a NSTextView ? I can't find how to do that.
Example code would be appreciated!

Answer 1

It's not possible to use a custom NSFormatter with a NSTextView. (That appears to be the province of NSControl, of which NSTextField is a subclass.)

However, it is possible to set up a delegate for your text view's text storage ( NSTextStorage ), and implement -textStorageWillProcessEditing: (a method of NSTextStorageDelegate ) ; this is where you could constrain your user's input. Your existing code for your custom NSFormatter might be adapted for use there.