I use a pocketmine client for iOS (not saying name because would be called advertising) and it’s good but it is no rarely updated and is rubbish if your not jailbroken (I’m jailbroken) I’m suggesting that a official pocketmine client is made for iOS
There actually used to be one. It was abandoned however. The same limits of an Android device running a server applied (lack of resources) and you had to be jailbroken for it to work at all.
The reason the one I’m using isn’t good unless jailbreak is because the developers only deliver core updates now