Several iOS apps for kbin / lemmy are now in development!
There are at least five apps that I know of currently in development for iOS. Unfortunately neither Memmy nor Mlem able to connect to kbin at the moment, something to do with the kbin-specific API from what @ernest, @BrooklynMan, and @gkd have said. Kmoon is specifically being developed for kbin and is multi-platform for iOS and Android (no TestFlight betas on that just yet):