Transition from web front-end to mobile iOS development. How difficult and how long?

Question

iOS

Good day, guys.
I'm very interested in mobile development for Apple products, in particular, development for iPhone and iPad, so I love mobility wildly :) entry threshold is clearly higher.
At that moment, what I know now: html, css, javascript with all the accompanying frameworks. I don’t know anything about server and classical languages, I looked at the C language a little, it seemed pretty easy to understand, the syntax is almost 1 in 1, like in JS.
The question is, how long will it take to learn obj-c, databases, and maybe what framework? And how difficult will it be to move from such a stack of technologies that I have now?
Thanks in advance!

Answer 1

Learn Swift better, I have a 1v1 situation with yours, also a web developer and also switching to iOS

Answer 2

We need to start Swift and Objective-C immediately becomes clearer :)