can key chain show passwords
can keychain show stored passwords
iPad 2 Wi-Fi, iOS 8.4.1
EDIT: I misread your subject line being in iOs.
You do this via iCloud Keychain
https://support.apple.com/en-us/HT204085
A third party thread is here. I have not tried it.
http://www.imore.com/how-access-icloud-keychain-passwords-credit-cards
The following holds for OS X
Open Keychain access, double click on an account.
There is an option to display that password. You will be asked for your administrative password. If you select always allow, you will not be challenged again should you wish to see the password for that account.
You can also right click and you should see option to copy the password. Same rules apply ( You will be asked for your administrative password. If you select always allow, you will not be challenged again should you wish to see the password for that account)