iOS Contacts How to Fetch contact by phone Number

Question

I just want to get contact given name and family name by phone number. I tried this but this is too much slow and cpu is hitting over %120.

let contactStore = CN         


        

Answer 1

SWIFT 4 UPDATE

1) Add to .plist

NSContactsUsageDescription
Our application needs to your contacts

2) Request Authorization if you don't have it

func requestAccess() {

    let store = CNContactStore()
    store.requestAccess(for: .contacts) { granted, error in
        guard granted else {
            DispatchQueue.main.async {
               self.presentSettingsActionSheet()
            }
            return
        }
    }
}

func presentSettingsActionSheet() {
    let alert = UIAlertController(title: "Permission to Contacts", message: "This app needs access to contacts in order to ...", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Go to Settings", style: .default) { _ in
        let url = URL(string: UIApplicationOpenSettingsURLString)!
        UIApplication.shared.open(url)
    })
    alert.addAction(UIAlertAction(title: "Cancel", style: .cancel))
    present(alert, animated: true)
}

2) Check Authorization Status if you ask for it before

    if CNContactStore.authorizationStatus(for: .contacts) == .authorized {
        getContacts()

    }

3) Call Get Contacts

    var contacts = [CNContact]()

    func getContacts(){

    let contactStore = CNContactStore()
    let keys = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactPhoneNumbersKey, CNContactImageDataAvailableKey, CNContactThumbnailImageDataKey]
    let request = CNContactFetchRequest(keysToFetch: keys as [CNKeyDescriptor])
    request.sortOrder = CNContactSortOrder.givenName

    do {
        try contactStore.enumerateContacts(with: request) {
            (contact, stop) in
            self.contacts.append(contact)
        }
    }
    catch {
        print("unable to fetch contacts")
    }
}

4) THIS IS THE FUNCTION TO GET THE CONTACT NAME OR BY NUMBER

    func getNameFromContacts(number: String) -> String {
    var contactFetched : CNContact
    var contactName = ""
    if contacts.count > 0 {

        let numberToBeCompared = number.components(separatedBy:CharacterSet.decimalDigits.inverted).joined(separator: "")
        for c in contacts {
            for n in c.phoneNumbers {
                if let numberRetrived = n.value as? CNPhoneNumber {
                     let numberRetrivedFixed = numberRetrived.stringValue.components(separatedBy:CharacterSet.decimalDigits.inverted).joined(separator: "")
                    if numberRetrivedFixed.elementsEqual(numberToBeCompared){
                        contactName = c.givenName
                        // OR get the contact --> c
                 contactFetched = c

                    }
                }
            }
        }

        return contactName

    } else {
        return ""
    }
}