How do you convert an iPhone OSStatus code to something useful?

Question

I am getting more than a little sick of this iPhone SDK and its documentation...

I am calling AudioConverterNew

in the documentation under Returns: it says \

Answer 1

for Security framework on IOS given that SecCopyErrorMessageString is missing on the platform it's DYI

add error codes at the bottom of

https://developer.apple.com/library/ios/documentation/Security/Reference/keychainservices

to your very own switch.

for example

        let status : OSStatus = SecItemAdd(query as CFDictionaryRef, nil)
        switch status {
        case errSecSuccess:
            return nil
        case errSecAuthFailed:
            // that's the result of dumping kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly into the query
            return "changing app lock type on a device without fingerprint and/or passcode setup is not allowed".localized
        default:
            return "unhandled case: implement this"
        }