Don’t know if this is already well known or not, but decided to post it in case it’s not.

For easy access to type your nPub on iOS, make a keyboard shortcut. Go to Settings > General > Keyboard > Text Replacement, then you can make essentially a “custom auto correct.”

Press the plus, and in the “Phrase” field, paste your full nPub, then in the “Shortcut” field, type something easy to remember, but you won’t use in normal conversation. For me, I made the shortcut “npubb” (just added another “b” because it’s simple) so now when I type “npubb” it auto corrects to my full nPub.