NSTextField – White text on black background, but black cursor

Since in practice the NSText* returned by -currentEditor for an NSTextField is always an NSTextView*, I added the following code to my custom NSTextField subclass:

-(BOOL) becomeFirstResponder
{
    BOOL    success = [super becomeFirstResponder];
    if( success )
    {
        // Strictly spoken, NSText (which currentEditor returns) doesn't
        // implement setInsertionPointColor:, but it's an NSTextView in practice.
        // But let's be paranoid, better show an invisible black-on-black cursor
        // than crash.
        NSTextView* textField = (NSTextView*) [self currentEditor];
        if( [textField respondsToSelector: @selector(setInsertionPointColor:)] )
            [textField setInsertionPointColor: [NSColor whiteColor]];
    }
    return success;
}

So if you’re already replacing this class because you’re doing custom background drawing, this might be a more encapsulated solution. Maybe there’s even a way to move this up into NSCell, which would be cleaner since NSCell is the one doing the drawing and knowing the colors anyway.