DaffiOne Wallet has not been released yet for iOS users. It will be released upon completion of the Android Beta testing and bug-fixing period.
The DaffiWallet (Pilot) iOS version available on the Apple Store was a pilot version solely supporting Algorand. It relied on AlgoExplorer and PureStake for its node connections and the display of the content of an account. As both of those services have announced they are shutting down, DaffiWallet (Pilot) iOS version will stop functioning once they have shut down. And, the wallet won't be able to obtain the information to display the content of an account, thus will return an error or a black screen.
If a user of DaffiWallet (Pilot) iOS wants to access his accounts, we suggest you import that account into Defly or Pera wallet.
A replacement DaffiOne Wallet which supports multiple chains in addition to Algorand is in development. DaffiOne Wallet is currently only available in Android Beta as we are finalizing the testing.
It was intended to keep DaffiWallet (Pilot) iOS up and running until we replace it with the DaffiOne Wallet iOS. But due to the short notification of AlgoExplorer terminating their services, there will be a short period during which we won't be able to support iOS users. All accounts created or imported into a Daffi wallet are non-custodial to Daffi and self-sovereign to the user. As such, they can be installed on any wallet that supports Algorand self-sovereign accounts.