'Need advice on building a diagonal keyboard for Iphone App

I want to make an IPhone App, but sort of a strange one. I want to make an app where the keyboard is on the bottom left corner of the screen. I don't have any experience with ios development but I have coding experience and web-dev experience. Would I have to build the keyboard from scratch with objective-c or UI kit or could I use Swift UI? Are there any libraries you could recommend to help me build this?

I know for instance that The New York Times mini-crossword has what appears to be an in-house keyboard https://nytco-assets.nytimes.com/m/ipad_ads_portrait_10_mini_puzzle-2.png

Here is sort of what I want it to look like: https://imgur.com/uXt8VKu

iosswiftobjective-ckeyboardios-keyboard-extension


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