UITabBar文字设置颜色

UITabBarItem *item = [UITabBarItem appearance];
     [item setTitleTextAttributes:@{
        NSFontAttributeName: [UIFont systemFontOfSize:14],
        NSForegroundColorAttributeName: [UIColor grayColor]
     } forState:UIControlStateNormal];
    [item setTitleTextAttributes:@{
        NSForegroundColorAttributeName: [UIColor redColor]
     } forState:UIControlStateSelected];
    self.tabBar.tintColor = UIColor.redColor;