在swift 3中获取联系人不起作用

import Contacts

let contactStore = CNContactStore()
contactStore.requestAccess(for: .contacts) { (granted, error) in
    if granted {
        // 获取联系人
    } else {
        // 用户拒绝了权限请求
    }
}

import Contacts

let contactStore = CNContactStore()
let keysToFetch = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactPhoneNumbersKey]

let fetchRequest = CNContactFetchRequest(keysToFetch: keysToFetch as [CNKeyDescriptor])
do {
    try contactStore.enumerateContacts(with: fetchRequest) { (contact, stop) in
        // 处理联系人
    }
} catch {
    // 获取联系人失败
}