Currently, I haven't found a way to do this for iOS 12.0. I've tried setting bar tint like so.
[mailController.navigationBar setTintColor:[UIColor whiteColor]];
Then, I tried setting the title text attribute with the following code
[mailController.navigationController.navigationBar setTitleTextAttributes:
@{NSForegroundColorAttributeName:[UIColor WhiteColor]};
I've tried more options that I found on StackOverflow, but none of them worked. I am hoping that someone found a reliable way to change the navigation bar title text color. It stays black no matter what I do. The bar button's colors change correctly, but not the navigation bar title.
Can you please try either one of these which lets you set the navigation bar color. For example: If the navigation bar is black color, then the text is set to white.
[[UINavigationBar appearance] setBarStyle: UIBarStyleBlack]
or
[[UINavigationBar appearance] setBarTintColor:[UIColor whiteColor]
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