iOS 环信demo的聊天页的title怎么是白色的，在哪里设置啊，我都崩溃了，问客服客服也不知道

        [[UINavigationBar appearance] setTitleTextAttributes:

         [NSDictionary dictionaryWithObjectsAndKeys:RGBACOLOR(245, 245, 245, 1), NSForegroundColorAttributeName, [UIFont fontWithName:@ "HelveticaNeue-CondensedBlack" size:21.0], NSFontAttributeName, nil]];