Keychain Services provides secure storage of passwords, keys, certificates, and notes for one or more users. A user can unlock a keychain with a single password, and any Keychain Services–aware application can then use that keychain to store and retrieve passwords. ~ Apple…

Typically when you create mobile app there is a team/person that is responsible for design, animations and something that is called User Experience. They investigate what is the best navigation that fits given app, they care about good…