How do I fix a completely white keyboard in iMessage on iPhone?

"How do I fix a completely white keyboard in iMessage on iPhone?: Okay, my phone is fully up to date, when I’m texting someone in imsg my keyboard is completely white, I can’t see the letters, numbers, nor punctuation and sometimes it not only when I’m using imsg. I’ve tried restarting my phone, I’ve tried the light and dark mode switch and anything else I can find to try to help on the internet and NOTHING!!! I MEAN NOTHING IS WORKING."

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Blank Keyboard on Apps on an iPhone:

A. Force Restart:

You say that you have restarted. But, have your Force Restated? Go Here: Force Restart iPhone - Apple Support

B. Rid of "System Data" (Formerly Called "Other"):

System Data is caches -- all of which gather overtime. They are created for apps so that they have a more ease use and quicker operability. Clearing them, you would fix a few bugs. See my User Tip: How to Clear "System Data" in your iPhone's Storage: - User TIp

Try this:

1. Go to Settings  > Accessibility > Display & Text Size.
2. Turn on Reduce Transparency.
3. Turn on Increase Contrast.