最近升级了iOS13系统，之前项目使用系统TabBarController创建的项目在启动的时候selectTitleColor 和 NormalTitleColor 有时候设置不起作用。
tabBarItem选中颜色有时为设置的颜色，有时变为系统蓝色；
tabBarItem未选中颜色有时为设置的颜色，有时变为系统蓝色；
适配如下：
if (@available(iOS 13.0, *)) {
// iOS 13以上
self.tabBar.tintColor = [UIColor F2400BRedColor];
self.tabBar.unselectedItemTintColor = [UIColor grayColor];
UITabBarItem *item = [UITabBarItem appearance];
[item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateNormal];
[item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateSelected];
} else {
// iOS 13以下
UITabBarItem *item = [UITabBarItem appearance];
[item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12], NSForegroundColorAttributeName:[UIColor grayColor]} forState:UIControlStateNormal];
[item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12], NSForegroundColorAttributeName:[UIColor F2400BRedColor]} forState:UIControlStateSelected];
}
查找资料过程中，发现还有以下设置也会起作用：
感谢博主「幻灬听」分享
原文链接:请点这里
Apple将设置UITabBarItem的文字属性的任务，交给了13中新添加的属性UITabBarItem.standardAppearance。代码如下：
viewController.tabBarItem.title = title;
if (@available(iOS 13.0, *)) {
UITabBarAppearance *appearance = [UITabBarAppearance new];
// 设置未被选中的颜色
appearance.stackedLayoutAppearance.normal.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor]};
// 设置被选中时的颜色
appearance.stackedLayoutAppearance.selected.titleTextAttributes = @{NSForegroundColorAttributeName: :[UIColor F2400BRedColor]};
viewController.tabBarItem.standardAppearance = appearance;
} else {
[viewController.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor grayColor]}];
}
以上内容仅做为我自己的学习及收藏内容，如有不对请指出，Thanks♪(･ω･)ﾉ~
