iOS13之后使用UITabBarAppearance设置tabBar未选中文字颜色的问题

设置方法

if (@available(iOS 13.0, *)) {
    UITabBarItemAppearance *inlineLayoutAppearance = [[UITabBarItemAppearance  alloc] init];
    inlineLayoutAppearance.normal.titlePositionAdjustment = self.titlePositionAdjustment;
    [inlineLayoutAppearance.normal setTitleTextAttributes:normalAttrs];
    [inlineLayoutAppearance.selected setTitleTextAttributes:selectedAttrs];

    UITabBarAppearance *standardAppearance = [[UITabBarAppearance alloc] init];
    standardAppearance.stackedLayoutAppearance = inlineLayoutAppearance;
    standardAppearance.backgroundColor = [UIColor cyl_systemBackgroundColor];
    standardAppearance.shadowImage = [UIImage qmui_imageWithColor:UIColorHex(E5E5E5) size:CGSizeMake(SCREEN_WIDTH, PixelOne) cornerRadius:0];
    self.tabBar.standardAppearance = standardAppearance;
        [[UITabBar appearance] setUnselectedItemTintColor:UIColorHex(999999)]; //
  }

iOS13的问题

无法成功设置tabBar未选中状态下的文字颜色

iOS14的问题

首次进入可成功设置tabBar未选中状态下的文字颜色，可当点击tabBar上某个item之后该item未选中状态下的设置的颜色无效。

解决方法

[[UITabBar appearance] setUnselectedItemTintColor:UIColorHex(999999)];

该方法可在iOS13以及之后的版本成功设置tabBar未选中状态下的文字颜色。