iOS 12.0 : Is there a way to set MFMailComposeViewController navigation bar title's text to white?

问题

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.

来源：https://stackoverflow.com/questions/52451156/ios-12-0-is-there-a-way-to-set-mfmailcomposeviewcontroller-navigation-bar-titl