Modern Swift borrows a lot from Rust! And it also has its own benefits, both ergonomic and also supporting eg generic in dynamic libraries
These days I mainly write Rust but I did write a semi complex iOS app and enjoyed Swift. I just didn't love how slow the type checker was and how it got lost. I recall having to break things into smaller bits to help the compiler, and there were some oddities about the language.
The gap between the two languages is quite small, it just makes me wish Apple was also all-in on Rust
Swift and Rust were developed at similar times. I think of them more as having similar influences than borrowing from each other.