CNContactStore execute fails

Question

I am working out how to use the Contacts framework, however some fairly simple code to create a contact is failing with an unexpected result. This is my code:

    let Store = CNContactStore()
    Store.requestAccess(for: .contacts, completionHandler:{ success, error in
        if success {
            let Contact = CNMutableContact()
            Contact.givenName = "Dave"
            Contact.familyName = "Nottage"
            let SaveRequest = CNSaveRequest()
            SaveRequest.add(Contact, toContainerWithIdentifier: nil)
            do {
                try Store.execute(SaveRequest)
                print("Success")
            }
            catch let error as NSError {
                print(error.localizedDescription)
            }
        } else {
            print("No access")
        }
    })

..and this is the result:

2019-02-22 10:30:56.050344+1030 ContactsTest[30329:25254955] [default] Unable to load Info.plist exceptions (eGPUOverrides)
2019-02-22 10:30:57.973724+1030 ContactsTest[30329:25254955] Could not get real path for Address Book lock folder: open() for F_GETPATH failed.
2019-02-22 10:30:57.973954+1030 ContactsTest[30329:25254955] Unable to open file lock: <ABProcessSharedLock: 0x600001752ac0: name=(null), lockFilePath=(null), localLock=<NSRecursiveLock: 0x600002914a80>{recursion count = 0, name = nil}, fileDescriptor=-1> Error Domain=NSPOSIXErrorDomain Code=14 "Bad address" UserInfo={ABFileDescriptor=-1}
The operation couldn’t be completed. (Foundation._GenericObjCError error 0.)

Any ideas on what might be causing this?

Edit: Note also that this is being compiled for macOS 10.14 SDK, and is running on macOS 10.14.3

Answer 1

The answer is to check the Contacts checkbox of App Data in the App Sandbox section in Capabilities and turn on the switch for App Sandbox.

Answer 2

Make sure you added key NSContactsUsageDescription in Info.plist.

Please refer to link.

Important

An iOS app linked on or after iOS 10.0 must include in its Info.plist file the usage description keys for the types of data it needs to access or it will crash. To access Contacts data specifically, it must include NSContactsUsageDescription.