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

The problem with your implementation is that you access the address book in every search you are making.

If instead you will hold in-memory the address book content after the first access you will not reach this high CPU usage.

1. First hold a lazy var in your controller that will hold the address book content:

   lazy var contacts: [CNContact] = {
       let contactStore = CNContactStore()
       let keysToFetch = [
           CNContactFormatter.descriptorForRequiredKeysForStyle(.FullName),
           CNContactEmailAddressesKey,
           CNContactPhoneNumbersKey,
           CNContactImageDataAvailableKey,
           CNContactThumbnailImageDataKey]
   
       // Get all the containers
       var allContainers: [CNContainer] = []
       do {
           allContainers = try contactStore.containersMatchingPredicate(nil)
       } catch {
           print("Error fetching containers")
       }
   
       var results: [CNContact] = []
   
       // Iterate all containers and append their contacts to our results array
       for container in allContainers {
           let fetchPredicate = CNContact.predicateForContactsInContainerWithIdentifier(container.identifier)
   
           do {
                let containerResults = try     contactStore.unifiedContactsMatchingPredicate(fetchPredicate, keysToFetch: keysToFetch)
               results.appendContentsOf(containerResults)
           } catch {
               print("Error fetching results for container")
           }
       }
   
       return results
   }()
   

   2. Iterate through the in-memory array when you are looking for a contact with a specific phone number:

   .

      func searchForContactUsingPhoneNumber(phoneNumber: String) -> [CNContact] {
       var result: [CNContact] = []
   
       for contact in self.contacts {
           if (!contact.phoneNumbers.isEmpty) {
               let phoneNumberToCompareAgainst = phoneNumber.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet).joinWithSeparator("")
               for phoneNumber in contact.phoneNumbers {
                   if let phoneNumberStruct = phoneNumber.value as? CNPhoneNumber {
                       let phoneNumberString = phoneNumberStruct.stringValue
                       let phoneNumberToCompare = phoneNumberString.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet).joinWithSeparator("")
                       if phoneNumberToCompare == phoneNumberToCompareAgainst {
                           result.append(contact)
                       }
                   }
               }
            } 
       }
   
       return result
   }
   

I tested it with a very big address book, it works smoothly.

Here is the entire view controller patched together for reference.

import UIKit
import Contacts

class ViewController: UIViewController {

    lazy var contacts: [CNContact] = {
        let contactStore = CNContactStore()
        let keysToFetch = [
                CNContactFormatter.descriptorForRequiredKeysForStyle(.FullName),
                CNContactEmailAddressesKey,
                CNContactPhoneNumbersKey,
                CNContactImageDataAvailableKey,
                CNContactThumbnailImageDataKey]

        // Get all the containers
        var allContainers: [CNContainer] = []
        do {
            allContainers = try contactStore.containersMatchingPredicate(nil)
        } catch {
            print("Error fetching containers")
        }

        var results: [CNContact] = []

        // Iterate all containers and append their contacts to our results array
        for container in allContainers {
            let fetchPredicate = CNContact.predicateForContactsInContainerWithIdentifier(container.identifier)

            do {
                let containerResults = try contactStore.unifiedContactsMatchingPredicate(fetchPredicate, keysToFetch: keysToFetch)
                results.appendContentsOf(containerResults)
            } catch {
                print("Error fetching results for container")
            }
        }

        return results
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let contact = searchForContactUsingPhoneNumber("(555)564-8583")
        print(contact)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func searchForContactUsingPhoneNumber(phoneNumber: String) -> [CNContact] {

        var result: [CNContact] = []

        for contact in self.contacts {
            if (!contact.phoneNumbers.isEmpty) {
                let phoneNumberToCompareAgainst = phoneNumber.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet).joinWithSeparator("")
                for phoneNumber in contact.phoneNumbers {
                    if let phoneNumberStruct = phoneNumber.value as? CNPhoneNumber {
                        let phoneNumberString = phoneNumberStruct.stringValue
                        let phoneNumberToCompare = phoneNumberString.componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet).joinWithSeparator("")
                        if phoneNumberToCompare == phoneNumberToCompareAgainst {
                            result.append(contact)
                        }
                    }
                }
            }
        }

        return result
    }
}

I used flohei's answer for the lazy var part.