Storing multiple username and passwords credential in keychain

Question

I'm creating an application that requires the user to log in, I've read that it's a bad idea to use NSUserDefaults so I want to go with either storing the data inside a sqlite databaseor use keychain access. My app will show data based on what user is logged in from that device, so if two people have an account with me they can log in from the same device and it shows the data pertaining to their log in. Is it possible to store multiple log in credentials with keychain or should I go with an sqlite database so that I can properly connect it to the data pertaining to that log in? If keychain is the best way can someone point me to a demo that lets you store multiple users in the keychain.

Update

The reason I need to store multiple user/pass in the keychain is because after they log in they are required to create a four digit pin to use within the app. As of now if someone else logs in it uses the previous pin instead of asking for the user to create a new one. Should I add an if statement to check if the user is in the keychain and if they are not there call the pincontroller. Using the keychain how can I tell which pin belongs to which user?

Answer 1

iOS provides a very secure way to do this via the keychain. It's really the only way to store this type of information so I strongly recommend against rolling your own solution.

If you want to access the keychain you can use one of the many libraries available for this. Here are two:

https://github.com/soffes/sskeychain

https://github.com/secondgear/SGKeychain