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I would start here: https://www.hackingwithswift.com/100/swiftui
Paul has put together a great resource and it's free so you have nothing to lose. I followed his course and have 2 apps in the app store, and I'm now working on a more complex but hopefully useful app that I plan to launch later this year.
No idea about iOS specifically, but I would always go for official documentation first.
For some other people this might differ, but whenever I have to interact with them, the Apple docs are absurdly bad. They read more as an autogenerated list from the API than something an actual human wrote trying to be useful. In general I agree, for most languages/packages the official docs are great
I’ve been thinking of diving into the Swift deep end myself. Good luck to you!
I've learned it with Stanford's CS193p course. https://cs193p.sites.stanford.edu/
It's the best way to learn both the platform fundamentals, as well as good programming principles. Beware though, it's definitely for advanced students, and there's homework.
Maybe give exercism's Swift track a try?
Word of warning, I do find some of exercism's "lessons" hit or miss. Most of the time, the exercises seem to expect more knowledge of the language than what was given in the "lessons." Be prepared to do some searching, if the "lessons" don't provide further reading itself. It does also provide the ability for you to unlock and peek at other people's published solutions.
The big issue I have here is that there's a lot more to iOS development than just Swift. If it was just "learn Swift", I've taught myself multiple languages and I know how to do that pretty easily now. It's all the other things -- the iOS parts -- that I'm really struggling to start with.