NSButton how to color the text

-(void)setNSButtonTextColor:(NSButton *)button

                   andColor:(NSColor *)color

{

   // NSColor *color = [NSColor greenColor];

    NSMutableAttributedString *colorTitle = [[NSMutableAttributedString alloc] initWithAttributedString:         [button attributedTitle]];

    NSRange titleRange = NSMakeRange(0, [colorTitle length]);

    [colorTitle addAttribute:NSForegroundColorAttributeName value:color range:titleRange];

    [button setAttributedTitle:colorTitle];

}

call：

  NSColor* m_color_toolbar_button;

     m_color_toolbar_button =[NSColor purpleColor];

  m_BT1.title = @"ABC(100)";

    

   [self setNSButtonTextColor:m_BT1 andColor:m_color_toolbar_button];