Customize the title font color UITabbarItem

/* You may specify the font, text color, and shadow properties for the title in the text attributes dictionary, using the keys found in NSAttributedString.h.

   Chinese to the effect: You can specify the font, text color and shadow properties of the title text attributes dictionary, use the key NSAttributedString.h found.

 */

- (void)setTitleTextAttributes:(nullable NSDictionary<NSString *,id> *)attributes forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;

The following code is directly copied to the project to set the font color label

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                       [UIColor whiteColor], NSForegroundColorAttributeName,
                                                       nil] forState:UIControlStateNormal];
    
    UIColor *titleHighlightedColor = [UIColor getColor:@"05a2ea"];
    [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                       titleHighlightedColor, NSForegroundColorAttributeName,
                                                       nil] forState:UIControlStateSelected];