Swift Using Contacts Framework，搜索使用Identifier进行匹配

Question

尝试获取提供联系人标识符的联系人匹配失败。我希望返回联系人，然后使用与之关联的图像。我得到一个零匹配。谢谢你。这段代码是我从演示中获得的，我对编程有点陌生

import Contacts

var contact = CNContact()  
var contactStore = CNContactStore()

let foundContact = getContactFromID("94AAD3B1-E9E1-48C9-A796-F7EC1014230A")

func getContactFromID(contactID: String) -> CNContact {

    AppDelegate.getAppDelegate().requestForAccess { (accessGranted) -> Void in
        if accessGranted {

            let predicate = CNContact.predicateForContactsWithIdentifiers([contactID])

            let keys = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactEmailAddressesKey, CNContactPhoneNumbersKey, CNContactImageDataKey, CNContactImageDataAvailableKey]

            var contacts = [CNContact]()
            var message: String!

            let contactsStore = AppDelegate.getAppDelegate().contactStore

            do {
                contacts = try contactsStore.unifiedContactsMatchingPredicate(predicate, keysToFetch: keys)

                if contacts.count == 0 {
                    message = "No contacts were found matching the given name."
                }
            }
            catch {
                message = "Unable to fetch contacts."
            }


            if message != nil {
                dispatch_async(dispatch_get_main_queue(), { () -> Void in
                    Utility.showAlert(nil, message: message)
                })
            } else {

                dispatch_async(dispatch_get_main_queue(), { () -> Void in

                    self.contact = contacts[0]

                    print("self.contact: \(self.contact)")

                })
            }
        }
    }

    return self.contact
}

Answer 1

我解决了 :)，我删除了 dispatch_async 的东西，现在可以工作了:这里是固定代码。

func getContactFromID(contactID: String) -> CNContact {

        AppDelegate.getAppDelegate().requestForAccess { (accessGranted) -> Void in
            if accessGranted {

                let predicate = CNContact.predicateForContactsWithIdentifiers([contactID])

                let keys = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactEmailAddressesKey, CNContactPhoneNumbersKey, CNContactImageDataKey, CNContactImageDataAvailableKey]

                var contacts = [CNContact]()
                var message: String!

                let contactsStore = AppDelegate.getAppDelegate().contactStore

                do {
                    contacts = try contactsStore.unifiedContactsMatchingPredicate(predicate, keysToFetch: keys)

                    if contacts.count == 0 {
                        message = "No contacts were found matching the given name."
                    }
                }
                catch {
                    message = "Unable to fetch contacts."
                }

                 self.contact = contacts[0]
            }
        }
        return self.contact
    }