dpearson2699/swift-ios-skills

Agent skills for iOS, iPadOS, Swift, SwiftUI, and modern Apple framework development.

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name:: contacts-framework
description:: Read, create, update, and pick contacts using the Contacts and ContactsUI frameworks. Use when fetching contact data, saving new contacts, wrapping CNContactPickerViewController in SwiftUI, handling contact permissions, or working with CNContactStore fetch and save requests.

Contacts Framework

Name: dpearson2699/swift-ios-skills
Rating: 71.89999999999999 (1 reviews)
Author: dpearson2699

Fetch, create, update, and pick contacts from the user's Contacts database using CNContactStore, CNSaveRequest, and CNContactPickerViewController. Targets Swift 6.3 / iOS 26+.

Setup
Authorization
Fetching Contacts
Key Descriptors
Creating and Updating Contacts
Contact Picker
Observing Changes
Common Mistakes
Review Checklist
References

Setup

Project Configuration

Add NSContactsUsageDescription to Info.plist explaining why the app accesses contacts
No additional capability or entitlement is required for basic Contacts access
For contact notes access, add the com.apple.developer.contacts.notes entitlement

Imports

import Contacts       // CNContactStore, CNSaveRequest, CNContact
import ContactsUI     // CNContactPickerViewController

Authorization

Request access before fetching or saving contacts. The picker (CNContactPickerViewController) does not require authorization -- the system grants access only to the contacts the user selects.

let store = CNContactStore()

func requestAccess() async throws -> Bool {
    return try await store.requestAccess(for: .contacts)
}

// Check current status without prompting
func checkStatus() -> CNAuthorizationStatus {
    CNContactStore.authorizationStatus(for: .contacts)
}

Authorization States

Status	Meaning
`.notDetermined`	User has not been prompted yet
`.authorized`	Full read/write access granted
`.denied`	User denied access; direct to Settings
`.restricted`	Parental controls or MDM restrict access
`.limited`	iOS 18+: user granted access to selected contacts only

Fetching Contacts

Use unifiedContacts(matching:keysToFetch:) for predicate-based queries. Use enumerateContacts(with:usingBlock:) for batch enumeration of all contacts.

Fetch by Name

func fetchContacts(named name: String) throws -> [CNContact] {
    let predicate = CNContact.predicateForContacts(matchingName: name)
    let keys: [CNKeyDescriptor] = [
        CNContactGivenNameKey as CNKeyDescriptor,
        CNContactFamilyNameKey as CNKeyDescriptor,
        CNContactPhoneNumbersKey as CNKeyDescriptor
    ]
    return try store.unifiedContacts(matching: predicate, keysToFetch: keys)
}

Fetch by Identifier

func fetchContact(identifier: String) throws -> CNContact {
    let keys: [CNKeyDescriptor] = [
        CNContactGivenNameKey as CNKeyDescriptor,
        CNContactFamilyNameKey as CNKeyDescriptor,
        CNContactEmailAddressesKey as CNKeyDescriptor
    ]
    return try store.unifiedContact(withIdentifier: identifier, keysToFetch: keys)
}

Enumerate All Contacts

Perform I/O-heavy enumeration off the main thread.

func fetchAllContacts() throws -> [CNContact] {
    let keys: [CNKeyDescriptor] = [
        CNContactGivenNameKey as CNKeyDescriptor,
        CNContactFamilyNameKey as CNKeyDescriptor
    ]
    let request = CNContactFetchRequest(keysToFetch: keys)
    request.sortOrder = .givenName

    var contacts: [CNContact] = []
    try store.enumerateContacts(with: request) { contact, _ in
        contacts.append(contact)
    }
    return contacts
}

Key Descriptors

Only fetch the properties you need. Accessing an unfetched property throws CNContactPropertyNotFetchedException.

Common Keys

Key	Property
`CNContactGivenNameKey`	First name
`CNContactFamilyNameKey`	Last name
`CNContactPhoneNumbersKey`	Phone numbers array
`CNContactEmailAddressesKey`	Email addresses array
`CNContactPostalAddressesKey`	Mailing addresses array
`CNContactImageDataKey`	Full-resolution contact photo
`CNContactThumbnailImageDataKey`	Thumbnail contact photo
`CNContactBirthdayKey`	Birthday date components
`CNContactOrganizationNameKey`	Company name

Composite Key Descriptors

Use CNContactFormatter.descriptorForRequiredKeys(for:) to fetch all keys needed for formatting a contact's name.

let nameKeys = CNContactFormatter.descriptorForRequiredKeys(for: .fullName)
let keys: [CNKeyDescriptor] = [nameKeys, CNContactPhoneNumbersKey as CNKeyDescriptor]

Creating and Updating Contacts

Use CNMutableContact to build new contacts and CNSaveRequest to persist changes.

Creating a New Contact

func createContact(givenName: String, familyName: String, phone: String) throws {
    let contact = CNMutableContact()
    contact.givenName = givenName
    contact.familyName = familyName
    contact.phoneNumbers = [
        CNLabeledValue(
            label: CNLabelPhoneNumberMobile,
            value: CNPhoneNumber(stringValue: phone)
        )
    ]

    let saveRequest = CNSaveRequest()
    saveRequest.add(contact, toContainerWithIdentifier: nil) // nil = default container
    try store.execute(saveRequest)
}

Updating an Existing Contact

You must fetch the contact with the properties you intend to modify, create a mutable copy, change the properties, then save.

func updateContactEmail(identifier: String, email: String) throws {
    let keys: [CNKeyDescriptor] = [
        CNContactEmailAddressesKey as CNKeyDescriptor
    ]
    let contact = try store.unifiedContact(withIdentifier: identifier, keysToFetch: keys)
    guard let mutable = contact.mutableCopy() as? CNMutableContact else { return }

    mutable.emailAddresses.append(
        CNLabeledValue(label: CNLabelWork, value: email as NSString)
    )

    let saveRequest = CNSaveRequest()
    saveRequest.update(mutable)
    try store.execute(saveRequest)
}

Deleting a Contact

func deleteContact(identifier: String) throws {
    let keys: [CNKeyDescriptor] = [CNContactIdentifierKey as CNKeyDescriptor]
    let contact = try store.unifiedContact(withIdentifier: identifier, keysToFetch: keys)
    guard let mutable = contact.mutableCopy() as? CNMutableContact else { return }

    let saveRequest = CNSaveRequest()
    saveRequest.delete(mutable)
    try store.execute(saveRequest)
}

Contact Picker

CNContactPickerViewController lets users pick contacts without granting full Contacts access. The app receives only the selected contact data.

SwiftUI Wrapper

import SwiftUI
import ContactsUI

struct ContactPicker: UIViewControllerRepresentable {
    @Binding var selectedContact: CNContact?

    func makeUIViewController(context: Context) -> CNContactPickerViewController {
        let picker = CNContactPickerViewController()
        picker.delegate = context.coordinator
        return picker
    }

    func updateUIViewController(_ uiViewController: CNContactPickerViewController, context: Context) {}

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    final class Coordinator: NSObject, CNContactPickerDelegate {
        let parent: ContactPicker

        init(_ parent: ContactPicker) {
            self.parent = parent
        }

        func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
            parent.selectedContact = contact
        }

        func contactPickerDidCancel(_ picker: CNContactPickerViewController) {
            parent.selectedContact = nil
        }
    }
}

Using the Picker

struct ContactSelectionView: View {
    @State private var selectedContact: CNContact?
    @State private var showPicker = false

    var body: some View {
        VStack {
            if let contact = selectedContact {
                Text("\(contact.givenName) \(contact.familyName)")
            }
            Button("Select Contact") {
                showPicker = true
            }
        }
        .sheet(isPresented: $showPicker) {
            ContactPicker(selectedContact: $selectedContact)
        }
    }
}

Filtering the Picker

Use predicates to control which contacts appear and what the user can select.

let picker = CNContactPickerViewController()
// Only show contacts that have an email address
picker.predicateForEnablingContact = NSPredicate(format: "emailAddresses.@count > 0")
// Selecting a contact returns it directly (no detail card)
picker.predicateForSelectionOfContact = NSPredicate(value: true)

Observing Changes

Listen for external contact database changes to refresh cached data.

func observeContactChanges() {
    NotificationCenter.default.addObserver(
        forName: .CNContactStoreDidChange,
        object: nil,
        queue: .main
    ) { _ in
        // Refetch contacts -- cached CNContact objects are stale
        refreshContacts()
    }
}

Common Mistakes

DON'T: Fetch all keys when you only need a name

Over-fetching wastes memory and slows queries, especially for contacts with large photos.

// WRONG: Fetches everything including full-resolution photos
let keys: [CNKeyDescriptor] = [CNContactCompleteNameKey as CNKeyDescriptor,
    CNContactImageDataKey as CNKeyDescriptor,
    CNContactPhoneNumbersKey as CNKeyDescriptor,
    CNContactEmailAddressesKey as CNKeyDescriptor,
    CNContactPostalAddressesKey as CNKeyDescriptor,
    CNContactBirthdayKey as CNKeyDescriptor]

// CORRECT: Fetch only what you display
let keys: [CNKeyDescriptor] = [
    CNContactGivenNameKey as CNKeyDescriptor,
    CNContactFamilyNameKey as CNKeyDescriptor
]

DON'T: Access unfetched properties

Accessing a property that was not in keysToFetch throws CNContactPropertyNotFetchedException at runtime.

// WRONG: Only fetched name keys, now accessing phone
let keys: [CNKeyDescriptor] = [CNContactGivenNameKey as CNKeyDescriptor]
let contact = try store.unifiedContact(withIdentifier: id, keysToFetch: keys)
let phone = contact.phoneNumbers.first // CRASH

// CORRECT: Include the key you need
let keys: [CNKeyDescriptor] = [
    CNContactGivenNameKey as CNKeyDescriptor,
    CNContactPhoneNumbersKey as CNKeyDescriptor
]

DON'T: Mutate a CNContact directly

CNContact is immutable. You must call mutableCopy() to get a CNMutableContact.

// WRONG: CNContact has no setter
let contact = try store.unifiedContact(withIdentifier: id, keysToFetch: keys)
contact.givenName = "New Name" // Compile error

// CORRECT: Create mutable copy
guard let mutable = contact.mutableCopy() as? CNMutableContact else { return }
mutable.givenName = "New Name"

DON'T: Skip authorization and assume access

Without calling requestAccess(for:), fetch methods return empty results or throw.

// WRONG: Jump straight to fetch
let contacts = try store.unifiedContacts(matching: predicate, keysToFetch: keys)

// CORRECT: Check or request access first
let granted = try await store.requestAccess(for: .contacts)
guard granted else { return }
let contacts = try store.unifiedContacts(matching: predicate, keysToFetch: keys)

DON'T: Run heavy fetches on the main thread

enumerateContacts performs I/O. Running it on the main thread blocks the UI.

// WRONG: Main thread enumeration
func loadContacts() {
    try store.enumerateContacts(with: request) { contact, _ in ... }
}

// CORRECT: Run on a background thread
func loadContacts() async throws -> [CNContact] {
    try await Task.detached {
        var results: [CNContact] = []
        try store.enumerateContacts(with: request) { contact, _ in
            results.append(contact)
        }
        return results
    }.value
}

Review Checklist

References

Extended patterns (multi-select picker, vCard export, search optimization): references/contacts-patterns.md
Contacts framework
CNContactStore
CNContactFetchRequest
CNSaveRequest
CNMutableContact
CNContactPickerViewController
CNContactPickerDelegate
Accessing the contact store
NSContactsUsageDescription

skills

accessorysetupkit

activitykit

adattributionkit

alarmkit

app-clips

app-intents

app-store-optimization

app-store-review

apple-on-device-ai

appmigrationkit

audioaccessorykit

authentication

avkit

background-processing

browserenginekit

callkit

carplay

cloudkit

contacts-framework

references

SKILL.md

core-bluetooth

core-data

core-motion

core-nfc

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cryptokit

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debugging-instruments

device-integrity

dockkit

energykit

eventkit

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focus-engine

gamekit

healthkit

homekit

ios-accessibility

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ios-simulator

mapkit

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natural-language

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photokit

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realitykit

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scenekit

sensorkit

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spritekit

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swift-api-design-guidelines

swift-architecture

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swiftui-layout-components

swiftui-liquid-glass

swiftui-patterns

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swiftui-uikit-interop

swiftui-webkit

tabletopkit

tipkit

vision-framework

weatherkit

widgetkit

CHANGELOG.md

README.md

tile.json

dpearson2699/swift-ios-skills

SKILL.mdskills/contacts-framework/

Contacts Framework

Contents

Setup

Project Configuration

Imports

Authorization

Authorization States

Fetching Contacts

Fetch by Name

Fetch by Identifier

Enumerate All Contacts

Key Descriptors

Common Keys

Composite Key Descriptors

Creating and Updating Contacts

Creating a New Contact

Updating an Existing Contact

Deleting a Contact

Contact Picker

SwiftUI Wrapper

Using the Picker

Filtering the Picker

Observing Changes

Common Mistakes

DON'T: Fetch all keys when you only need a name

DON'T: Access unfetched properties

DON'T: Mutate a CNContact directly

DON'T: Skip authorization and assume access

DON'T: Run heavy fetches on the main thread

Review Checklist

References

dpearson2699/swift-ios-skills

SKILL.md.css-3qkkll{font-size:var(--chakra-font-sizes-sm);font-weight:var(--chakra-font-weights-normal);color:var(--chakra-colors-gray-300);}skills/contacts-framework/

Contacts Framework

Contents

Setup

Project Configuration

Imports

Authorization

Authorization States

Fetching Contacts

Fetch by Name

Fetch by Identifier

Enumerate All Contacts

Key Descriptors

Common Keys

Composite Key Descriptors

Creating and Updating Contacts

Creating a New Contact

Updating an Existing Contact

Deleting a Contact

Contact Picker

SwiftUI Wrapper

Using the Picker

Filtering the Picker

Observing Changes

Common Mistakes

DON'T: Fetch all keys when you only need a name

DON'T: Access unfetched properties

DON'T: Mutate a CNContact directly

DON'T: Skip authorization and assume access

DON'T: Run heavy fetches on the main thread

Review Checklist

References

SKILL.mdskills/contacts-framework/