SecCopyErrorMessageString gives “Use of unresolved identifier” in swift

问题

Trying to use SecCopyErrorMessageString to interpret errorCode. in swift :

    var result: OSStatus
    result = SecItemAdd(query as CFDictionary, nil);


    if result != errSecSuccess {
    let errorDescription = SecCopyErrorMessageString(result,nil)
   //     NSLog("Keychain Error: %@", errorDescription)

The error of "Unresolved identifier" starts from "SecCopyError..."

回答1:

The SecCopyErrorMessageString function only became available on iOS in version 11.3. Prior to that, it could only be used on OS X.

回答2:

The above answer is a bit outdated, according to Apple, iOS 11.3, tvOS 11.3 and watchOS 4.3 started to support this since the beta version of SDK.

You'd need to compile against those supported SDKs to use that function. Otherwise, only macOS support that for now.

回答3:

It may not be obvious: This API is part of the Security framework. You need to add the framework to your project target's Build Phases > Link Binary With Libraries.

来源：https://stackoverflow.com/questions/34053049/seccopyerrormessagestring-gives-use-of-unresolved-identifier-in-swift