I have this problem all the time. My current process is to:
1. open the App store but don't click on anything
2. hit home button
3. launch keepass client
4. navigate to apple account entry
5. copy password
6. double tap home button to bring up multitasking menu
7. tap app store
8. click install
9. paste password
It feels really stupid doing it, but you can get pretty quick at it. I can't wait for my next iPhone upgrade with touchid.
1. open the App store but don't click on anything 2. hit home button 3. launch keepass client 4. navigate to apple account entry 5. copy password 6. double tap home button to bring up multitasking menu 7. tap app store 8. click install 9. paste password
It feels really stupid doing it, but you can get pretty quick at it. I can't wait for my next iPhone upgrade with touchid.