Ios 如何检查通讯簿联系人是否有姓名？

我已经在Swift中创建了一个应用程序，当我尝试获取通讯录联系人时，检查该联系人是否有电子邮件，但当我尝试检查是否有姓名时，我得到一个错误

  func peoplePickerNavigationController(peoplePicker: ABPeoplePickerNavigationController!, shouldContinueAfterSelectingPerson person: ABRecordRef!) -> String {
    let emails: ABMultiValueRef = ABRecordCopyValue(person, kABPersonEmailProperty).takeUnretainedValue()

    if (ABMultiValueGetCount(emails) > 0) { //here check if have email

 let name: ABMultiValueRef = ABRecordCopyValue(person, kABPersonFirstNameProperty).takeUnretainedValue()
        if(ABMultiValueGetCount(name)!=nil){//Here try check if have name, but this is incorrect form to do this ...

我如何检查这是有名字还是姓

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谢谢

“Type Int不符合协议NSLiteralConvertible.”但如果我使用==0检查是否没有姓名，则执行此操作时会发生崩溃。没有任何表单检查联系人是否没有姓名？