在Swift中搜索1,000个联系人

Question

我已成功编写了一个搜索用户联系人的程序，但效果非常低效。它使用嵌套的for和if语句，整体上非常混乱。当我在我的模拟器上运行时，它运行正常，但速度很慢。

有谁知道更好的方式来写这个？

这就是我目前所拥有的：

import UIKit
import Contacts

class ChatViewController: UIViewController {
@IBOutlet weak var contactTextField: UITextField!
@IBOutlet weak var contactNameView: UIView!

let contactStore = CNContactStore()
var contacts = [CNContact]()
let keys = [CNContactFormatter.descriptorForRequiredKeys(for: .fullName), CNContactPhoneNumbersKey] as [Any]



@IBAction func contactTextFieldChanged(_ sender: Any) {
    if contactTextField.text != nil {
        contactTableView.isHidden = false

        let request = CNContactFetchRequest(keysToFetch: keys as! [CNKeyDescriptor])
        do {
            try contactStore.enumerateContacts(with: request){
                (contact, stop) in
                self.contacts.append(contact)
                for familyName in contact.familyName{
                    for givenName in contact.givenName{
                        for phoneNumber in contact.phoneNumbers {
                            if String(describing: phoneNumber) != ""{
                            if String(describing: phoneNumber) == self.contactTextField.text || String(describing: givenName) == self.contactTextField.text || String(describing: familyName) == self.contactTextField.text{
                                if let number = phoneNumber.value as? CNPhoneNumber, let label = phoneNumber.label {
                                    let localizedLabel = CNLabeledValue<CNPhoneNumber>.localizedString(forLabel: label)
                                    print("\(contact.givenName) \(contact.familyName) tel:\(localizedLabel) -- \(number.stringValue)")
                                }
                            }
                        }
                        }
                    }
                }
            }
            print(contacts)
        } catch {
            print("unable to fetch contacts")
        }
    }
}
}