Would you not be better using UIColor.systembackground to avoid annoying dark mode users?
Anyway, this code works for me (Swift, but you should be able to change it easily)
self.navigationController?.navigationBar.backgroundColor = UIColor.white
self.navigationController?.navigationBar.tintColor = UIColor.white
That is assuming your VC is embedded in a navigation controller that is.
davidjs_uk
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Ah! Sorry I misread your question. You wanted text color not background. Sorry!
You could write a custom class to archive your image data which might reduce the size. I have an example I could share if you like?