A possible solution to change the text color consists in using the appearance proxy of the UIButton inside the UIMenuController. The thing is it uses directly the private UIButton subclass used by Apple in the Menu Controller. I would never recommend to access a private Apple class (and furthermore through its name), but in that specific Menu Controller color customization case I think that's the best solution. It lets you define the clean way your view appearances.
Swift
(NSClassFromString("UICalloutBarButton")! as! UIButton.Type).appearance().setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
Objective-C
[[NSClassFromString(@"UICalloutBarButton") appearance] setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…