设置UITabBarItem和UIBarButtonItem字体颜色

由于系统会自动渲染，所以要使字体颜色达到自己想要的效果，可以有下面这种方法

 NSMutableDictionary *textattri=[NSMutableDictionarydictionary];

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

    NSMutableDictionary *selecttextattri=[NSMutableDictionarydictionary];

    selecttextattri[NSForegroundColorAttributeName]=[UIColororangeColor];

UIBarButtonItem *item=[UIBarButtonItemappearance];

    NSMutableDictionary *textattri=[NSMutableDictionarydictionary];

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

    NSMutableDictionary *selecttextattri=[NSMutableDictionarydictionary];

    selecttextattri[NSForegroundColorAttributeName]=[UIColororangeColor];