UITabBar 设置选中、未选中状态下title的字体颜色

一、如果只是设置选中状态的字体颜色,使用 tintColor  就可以达到效果

self.tabBar.tintColor = [UIColor redColor];

二、但如果要将未选中状态和选中状态下的颜色都改变,可以使用 setTitleTextAttributes:<#(nullable NSDictionary *)#> forState:<#(UIControlState)#> 达到效果

[nav.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor redColor]} forState:UIControlStateNormal];
[nav.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor blueColor]} forState:UIControlStateSelected];

       或者

[[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor redColor]} forState:UIControlStateNormal];
[[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor blueColor]} forState:UIControlStateSelected];


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