FYI, a lemmy iOS app, Mlem, is in active development, and we hope to be at 1.0 by July 1. It's heavily inspired by Apollo, but, obviously, with changes for lemmy.
Stay tuned and subscribe to c/mlemapp for updates!
Edit: I want to note that, since one of the biggest sticking points with 3rd-party apps has been both accessibility for the blind and deaf and mod tools, they're both on our minds as we design the interface. Getting both right will, of course, take time, but we want everyone to know that we fully intend to make our app usable for everyone.