Here’s how Lastpass does it on their iOS app:
Lastpass - enter the vault on iOS app:
Which is more in line with the webversion in fact of Bitwarden.
And that is why I love this Bitwarden redesign by Büşra Değirmenci:
See more of her re-imagination for a Bitwarden iOS app overhere:
https://www.behance.net/gallery/104956981/Bitwarden-Redesign
And place your vote overhere 