? ? ? ? ? ? //title上移
//? ? ? ? ? ? [vc.tabBarItem setTitlePositionAdjustment:UIOffsetMake(0,y)];
? ? ? ? ? ? //image上移
? ? ? ? ? ? viewController.tabBarItem.imageInsets=UIEdgeInsetsMake(-15,0,15,0);
? ? ? ? ? ? //这里y为0时即系统title位置，y小于0时title上移，image上移时x小于0，x与w为相反数，image位置才会显示在中间。
? ? ? ? ? ? 文字设置富文本
UITabBarItem *item = [UITabBarItem appearanceWhenContainedIn:self, nil];
? ? NSMutableDictionary *dic = [NSMutableDictionary dictionary];
? ? dic[NSForegroundColorAttributeName] = [UIColor whiteColor];
? ? dic[NSFontAttributeName] = [UIFont systemFontOfSize:12];
? ? [item setTitleTextAttributes:dic forState:UIControlStateSelected];
