設置UITabBarItem和UIBarButtonItem字體顏色

由於系統會自動渲染，所以要使字體顏色達到自己想要的效果，可以有下面這種方法

 NSMutableDictionary *textattri=[NSMutableDictionary dictionary];

    textattri[NSForegroundColorAttributeName]=SLColor(123, 123, 123);

    NSMutableDictionary *selecttextattri=[NSMutableDictionary dictionary];

    selecttextattri[NSForegroundColorAttributeName]=[UIColor orangeColor];

UIBarButtonItem *item=[UIBarButtonItem appearance];

    NSMutableDictionary *textattri=[NSMutableDictionary dictionary];

    textattri[NSForegroundColorAttributeName]=SLColor(123, 123, 123);

    NSMutableDictionary *selecttextattri=[NSMutableDictionary dictionary];

    selecttextattri[NSForegroundColorAttributeName]=[UIColor orangeColor];