// 1.设置选中文字颜色
[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor colorWithRed:234/255.0 green:50/255.0 blue:64/255.0 alpha:1],NSForegroundColorAttributeName, nil] forState:UIControlStateSelected];
原文：http://www.cnblogs.com/lys-iOS-study/p/5684208.html