yes, it is possible to connect with Ethereum with [web3swift][1]. This lib is not official from Ethereum but This lib can connect with Ethereum blockchain. For more reference hit this link
https://medium.com/@shivangpandey195/getting-started-with-web3swift-1a2454481f70 and implement web3swift lib in your XCode project.


  [1]: https://github.com/skywinder/web3swift