/swiftui-uikit-interop

Representable Recipes

Complete working recipes for common UIKit wrapping scenarios. Each recipe includes the full UIViewRepresentable or UIViewControllerRepresentable struct, the Coordinator with delegate methods, a SwiftUI usage example, and gotchas specific to that wrapper.

Contents

• 1. MKMapView Wrapper
• 2. UITextView Wrapper (Attributed Text)
• 3. AVCaptureVideoPreviewLayer Wrapper
• 4. PHPickerViewController Wrapper
• 5. MFMailComposeViewController Wrapper
• 6. UIActivityViewController Wrapper (Share Sheet)
• 7. UISearchBar Wrapper
• 8. PDFView Wrapper (PDFKit)
• 9. MFMessageComposeViewController Wrapper

Native WebKit for SwiftUI now covers modern embedded web content on iOS 26+. See the swiftui-webkit skill for WebView, WebPage, navigation policies, JavaScript calls, and migration guidance. Keep this file focused on generic representable patterns.

1. MKMapView Wrapper

Display a map with annotations, track region changes, and toggle map type.

import SwiftUI
import MapKit

struct MapViewRepresentable: UIViewRepresentable {
    @Binding var region: MKCoordinateRegion
    @Binding var mapType: MKMapType
    var annotations: [MKPointAnnotation]
    var onRegionChanged: ((MKCoordinateRegion) -> Void)?

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

    func makeUIView(context: Context) -> MKMapView {
        let mapView = MKMapView()
        mapView.delegate = context.coordinator
        mapView.showsUserLocation = true
        return mapView
    }

    func updateUIView(_ uiView: MKMapView, context: Context) {
        // Update map type
        if uiView.mapType != mapType {
            uiView.mapType = mapType
        }

        // Update region -- guard against tiny differences to avoid feedback loops
        let currentCenter = uiView.region.center
        let threshold = 0.0001
        if abs(currentCenter.latitude - region.center.latitude) > threshold ||
           abs(currentCenter.longitude - region.center.longitude) > threshold {
            uiView.setRegion(region, animated: true)
        }

        // Diff annotations
        let existing = Set(uiView.annotations.compactMap { $0 as? MKPointAnnotation })
        let incoming = Set(annotations)
        let toRemove = existing.subtracting(incoming)
        let toAdd = incoming.subtracting(existing)
        uiView.removeAnnotations(Array(toRemove))
        uiView.addAnnotations(Array(toAdd))
    }

    final class Coordinator: NSObject, MKMapViewDelegate {
        var parent: MapViewRepresentable

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

        func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
            parent.region = mapView.region
            parent.onRegionChanged?(mapView.region)
        }

        func mapView(
            _ mapView: MKMapView,
            viewFor annotation: MKAnnotation
        ) -> MKAnnotationView? {
            guard !(annotation is MKUserLocation) else { return nil }
            let id = "pin"
            let view = mapView.dequeueReusableAnnotationView(withIdentifier: id)
                ?? MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: id)
            view.annotation = annotation
            return view
        }
    }
}

Usage

struct MapScreen: View {
    @State private var region = MKCoordinateRegion(
        center: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194),
        span: MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
    )
    @State private var mapType: MKMapType = .standard

    var body: some View {
        MapViewRepresentable(
            region: $region,
            mapType: $mapType,
            annotations: []
        )
        .ignoresSafeArea()
    }
}

Gotchas

• Region update loops. The delegate writes to @Binding region, which triggers updateUIView, which calls setRegion, which triggers the delegate again. The threshold guard is essential.
• Annotation diffing. MKMapView does not handle duplicate annotations well. Always diff before adding/removing.
• Native SwiftUI Map. For iOS 17+, prefer the native Map view unless you need delegate-level control (custom overlays, clustering, etc.).

2. UITextView Wrapper (Attributed Text)

Wrap UITextView for rich text editing with NSAttributedString binding and placeholder support.

import SwiftUI

struct RichTextEditor: UIViewRepresentable {
    @Binding var attributedText: NSAttributedString
    var placeholder: String = ""
    @Binding var isFirstResponder: Bool

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

    func makeUIView(context: Context) -> UITextView {
        let textView = UITextView()
        textView.delegate = context.coordinator
        textView.font = .preferredFont(forTextStyle: .body)
        textView.adjustsFontForContentSizeCategory = true
        textView.backgroundColor = .clear
        textView.textContainerInset = UIEdgeInsets(top: 8, left: 4, bottom: 8, right: 4)

        // Placeholder label
        let label = UILabel()
        label.text = placeholder
        label.font = .preferredFont(forTextStyle: .body)
        label.textColor = .placeholderText
        label.tag = 999
        label.translatesAutoresizingMaskIntoConstraints = false
        textView.addSubview(label)
        NSLayoutConstraint.activate([
            label.topAnchor.constraint(equalTo: textView.topAnchor, constant: 8),
            label.leadingAnchor.constraint(equalTo: textView.leadingAnchor, constant: 8),
        ])

        return textView
    }

    func updateUIView(_ uiView: UITextView, context: Context) {
        if uiView.attributedText != attributedText {
            uiView.attributedText = attributedText
        }

        // Update placeholder visibility
        if let label = uiView.viewWithTag(999) as? UILabel {
            label.isHidden = !uiView.text.isEmpty
        }

        // First responder management
        if isFirstResponder && !uiView.isFirstResponder {
            uiView.becomeFirstResponder()
        } else if !isFirstResponder && uiView.isFirstResponder {
            uiView.resignFirstResponder()
        }
    }

    @available(iOS 16.0, *)
    func sizeThatFits(
        _ proposal: ProposedViewSize,
        uiView: UITextView,
        context: Context
    ) -> CGSize? {
        let width = proposal.width ?? UIView.layoutFittingExpandedSize.width
        let size = uiView.sizeThatFits(CGSize(width: width, height: .greatestFiniteMagnitude))
        return CGSize(width: width, height: max(size.height, 44))
    }

    final class Coordinator: NSObject, UITextViewDelegate {
        var parent: RichTextEditor

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

        func textViewDidChange(_ textView: UITextView) {
            parent.attributedText = textView.attributedText ?? NSAttributedString()
            if let label = textView.viewWithTag(999) as? UILabel {
                label.isHidden = !textView.text.isEmpty
            }
        }

        func textViewDidBeginEditing(_ textView: UITextView) {
            parent.isFirstResponder = true
        }

        func textViewDidEndEditing(_ textView: UITextView) {
            parent.isFirstResponder = false
        }
    }
}

Usage

struct NotesEditorView: View {
    @State private var text = NSAttributedString()
    @State private var isFocused = false

    var body: some View {
        RichTextEditor(
            attributedText: $text,
            placeholder: "Write something...",
            isFirstResponder: $isFocused
        )
        .frame(minHeight: 100)
    }
}

Gotchas

• NSAttributedString comparison. The equality check in updateUIView is critical -- without it, every keystroke triggers a full re-render loop.
• First responder management. Avoid calling becomeFirstResponder() unconditionally in updateUIView -- it steals focus from other fields.
• iOS 26 alternative. TextEditor in iOS 26 supports AttributedString natively. Prefer it unless you need NSAttributedString or delegate-level control.

3. AVCaptureVideoPreviewLayer Wrapper

Display a live camera preview. The preview layer requires a UIView host.

import SwiftUI
import AVFoundation

struct CameraPreview: UIViewRepresentable {
    let session: AVCaptureSession

    func makeUIView(context: Context) -> CameraPreviewUIView {
        let view = CameraPreviewUIView()
        view.previewLayer.session = session
        view.previewLayer.videoGravity = .resizeAspectFill
        return view
    }

    func updateUIView(_ uiView: CameraPreviewUIView, context: Context) {
        // Session is reference type -- no update needed unless swapping sessions
        if uiView.previewLayer.session !== session {
            uiView.previewLayer.session = session
        }
    }
}

final class CameraPreviewUIView: UIView {
    override class var layerClass: AnyClass { AVCaptureVideoPreviewLayer.self }

    var previewLayer: AVCaptureVideoPreviewLayer {
        layer as! AVCaptureVideoPreviewLayer
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        previewLayer.frame = bounds
    }
}

Usage

struct CameraScreen: View {
    @State private var cameraManager = CameraManager()

    var body: some View {
        CameraPreview(session: cameraManager.session)
            .ignoresSafeArea()
            .task { await cameraManager.start() }
    }
}

Gotchas

• Use a custom UIView subclass with layerClass. Overriding layerClass avoids adding a sublayer and ensures the preview layer resizes automatically with the view.
• Session management belongs outside the representable. Create and manage AVCaptureSession in a separate model. The representable only displays it.
• Orientation. Set previewLayer.connection?.videoRotationAngle if supporting device rotation.

4. PHPickerViewController Wrapper

Multi-select photo picker that loads selected images asynchronously.

import SwiftUI
import PhotosUI

struct PhotoPicker: UIViewControllerRepresentable {
    @Binding var selectedImages: [UIImage]
    var selectionLimit: Int = 0  // 0 = unlimited
    @Environment(\.dismiss) private var dismiss

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

    func makeUIViewController(context: Context) -> PHPickerViewController {
        var config = PHPickerConfiguration(photoLibrary: .shared())
        config.filter = .images
        config.selectionLimit = selectionLimit
        config.preferredAssetRepresentationMode = .current

        let picker = PHPickerViewController(configuration: config)
        picker.delegate = context.coordinator
        return picker
    }

    func updateUIViewController(_ uiViewController: PHPickerViewController, context: Context) {
        // Nothing to update -- configuration is immutable after creation
    }

    final class Coordinator: NSObject, PHPickerViewControllerDelegate {
        let parent: PhotoPicker

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

        func picker(
            _ picker: PHPickerViewController,
            didFinishPicking results: [PHPickerResult]
        ) {
            parent.dismiss()

            guard !results.isEmpty else { return }

            Task { @MainActor in
                var images: [UIImage] = []
                for result in results {
                    if let image = await loadImage(from: result.itemProvider) {
                        images.append(image)
                    }
                }
                parent.selectedImages = images
            }
        }

        private func loadImage(from provider: NSItemProvider) async -> UIImage? {
            await withCheckedContinuation { continuation in
                if provider.canLoadObject(ofClass: UIImage.self) {
                    provider.loadObject(ofClass: UIImage.self) { image, _ in
                        continuation.resume(returning: image as? UIImage)
                    }
                } else {
                    continuation.resume(returning: nil)
                }
            }
        }
    }
}

Usage

struct ImagePickerDemo: View {
    @State private var images: [UIImage] = []
    @State private var showPicker = false

    var body: some View {
        VStack {
            ScrollView(.horizontal) {
                HStack {
                    ForEach(images.indices, id: \.self) { i in
                        Image(uiImage: images[i])
                            .resizable()
                            .scaledToFill()
                            .frame(width: 100, height: 100)
                            .clipShape(.rect(cornerRadius: 8))
                    }
                }
            }
            Button("Pick Photos") { showPicker = true }
        }
        .sheet(isPresented: $showPicker) {
            PhotoPicker(selectedImages: $images, selectionLimit: 5)
        }
    }
}

Gotchas

• Always dismiss in the delegate. picker(_:didFinishPicking:) is called for both selection and cancellation (with empty results). Dismiss in both cases.
• Async image loading. NSItemProvider.loadObject is completion-based. Wrap in withCheckedContinuation for async/await usage. Load images after dismissal to avoid blocking the picker UI.
• iOS 17 alternative. PhotosUI.PhotosPicker is a native SwiftUI view. Prefer it unless you need custom picker UI or advanced filtering.

5. MFMailComposeViewController Wrapper

Present the system email composer with pre-filled fields and handle the result.

import SwiftUI
import MessageUI

struct MailComposer: UIViewControllerRepresentable {
    let subject: String
    let recipients: [String]
    let body: String
    var isHTML: Bool = false
    var onResult: ((MFMailComposeResult) -> Void)?
    @Environment(\.dismiss) private var dismiss

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

    func makeUIViewController(context: Context) -> MFMailComposeViewController {
        let controller = MFMailComposeViewController()
        controller.mailComposeDelegate = context.coordinator
        controller.setSubject(subject)
        controller.setToRecipients(recipients)
        controller.setMessageBody(body, isHTML: isHTML)
        return controller
    }

    func updateUIViewController(_ uiViewController: MFMailComposeViewController, context: Context) {
        // Cannot update mail compose after presentation
    }

    final class Coordinator: NSObject, MFMailComposeViewControllerDelegate {
        let parent: MailComposer

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

        func mailComposeController(
            _ controller: MFMailComposeViewController,
            didFinishWith result: MFMailComposeResult,
            error: Error?
        ) {
            parent.onResult?(result)
            parent.dismiss()
        }
    }
}

Usage

struct FeedbackView: View {
    @State private var showMail = false

    var body: some View {
        Button("Send Feedback") {
            guard MFMailComposeViewController.canSendMail() else { return }
            showMail = true
        }
        .sheet(isPresented: $showMail) {
            MailComposer(
                subject: "App Feedback",
                recipients: ["support@example.com"],
                body: "I have feedback about..."
            ) { result in
                print("Mail result: \(result.rawValue)")
            }
        }
    }
}

Gotchas

• Check canSendMail() before presenting. If it returns false, do not display MFMailComposeViewController; show fallback UI or disable the mail action.
• Cannot update after presentation. updateUIViewController is intentionally empty -- the mail compose API does not support changing fields after the controller is shown.
• The delegate protocol name is MFMailComposeViewControllerDelegate, not MFMailComposeDelegate.

6. UIActivityViewController Wrapper (Share Sheet)

Present the system share sheet. This is a UIViewControllerRepresentable because UIActivityViewController is a controller, not a view.

import SwiftUI

struct ShareSheet: UIViewControllerRepresentable {
    let items: [Any]
    var activities: [UIActivity]? = nil
    var excludedTypes: [UIActivity.ActivityType]? = nil

    func makeUIViewController(context: Context) -> UIActivityViewController {
        let controller = UIActivityViewController(
            activityItems: items,
            applicationActivities: activities
        )
        controller.excludedActivityTypes = excludedTypes
        return controller
    }

    func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {
        // Cannot update after presentation
    }
}

Usage

struct ContentView: View {
    @State private var showShare = false

    var body: some View {
        Button("Share") { showShare = true }
            .sheet(isPresented: $showShare) {
                ShareSheet(items: ["Check out this app!", URL(string: "https://example.com")!])
                    .presentationDetents([.medium])
            }
    }
}

Gotchas

• Present via .sheet. Do not try to use UIActivityViewController as an inline view -- it is a modal controller.
• iPad requires popoverPresentationController. When using on iPad outside of .sheet, set the source view/rect on the popover controller. SwiftUI's .sheet handles this automatically.
• iOS 16+ alternative. ShareLink is a native SwiftUI view for Transferable items. Prefer it for simple sharing.

7. UISearchBar Wrapper

Wrap UISearchBar with delegate-based callbacks, debounce support, and cancel button handling.

import SwiftUI
import Combine

struct SearchBar: UIViewRepresentable {
    @Binding var text: String
    var placeholder: String = "Search"
    var onSearch: ((String) -> Void)?
    var onCancel: (() -> Void)?

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

    func makeUIView(context: Context) -> UISearchBar {
        let searchBar = UISearchBar()
        searchBar.delegate = context.coordinator
        searchBar.placeholder = placeholder
        searchBar.searchBarStyle = .minimal
        searchBar.autocapitalizationType = .none
        return searchBar
    }

    func updateUIView(_ uiView: UISearchBar, context: Context) {
        if uiView.text != text {
            uiView.text = text
        }
    }

    final class Coordinator: NSObject, UISearchBarDelegate {
        var parent: SearchBar
        private var debounceTask: Task<Void, Never>?

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

        func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
            parent.text = searchText
            searchBar.showsCancelButton = !searchText.isEmpty

            // Debounce search
            debounceTask?.cancel()
            debounceTask = Task { @MainActor in
                try? await Task.sleep(for: .milliseconds(300))
                guard !Task.isCancelled else { return }
                parent.onSearch?(searchText)
            }
        }

        func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
            debounceTask?.cancel()
            parent.onSearch?(parent.text)
            searchBar.resignFirstResponder()
        }

        func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
            parent.text = ""
            parent.onCancel?()
            searchBar.resignFirstResponder()
            searchBar.showsCancelButton = false
        }
    }
}

Usage

struct SearchableList: View {
    @State private var query = ""
    @State private var results: [String] = []

    var body: some View {
        VStack(spacing: 0) {
            SearchBar(text: $query, placeholder: "Search items") { text in
                results = performSearch(text)
            }
            List(results, id: \.self) { Text($0) }
        }
    }
}

Gotchas

• Native .searchable modifier. Prefer SwiftUI's .searchable(text:) modifier for standard search patterns. Use this wrapper only when you need precise control over search bar appearance or delegate timing.
• Debounce with Task.sleep. Cancel the previous task before starting a new one to debounce. Combine is not needed.
• Cancel button state. Toggle showsCancelButton in the delegate, not in updateUIView, to avoid layout jumps.

8. PDFView Wrapper (PDFKit)

Display PDF documents in SwiftUI using PDFView from PDFKit. Supports loading from URL, Data, or file path, with configurable display mode and auto-scaling.

import SwiftUI
import PDFKit

struct PDFViewer: UIViewRepresentable {
    let document: PDFDocument?
    var displayMode: PDFDisplayMode = .singlePageContinuous
    var autoScales: Bool = true
    var displayDirection: PDFDisplayDirection = .vertical
    var pageShadowsEnabled: Bool = true

    func makeUIView(context: Context) -> PDFView {
        let pdfView = PDFView()
        pdfView.displayMode = displayMode
        pdfView.displayDirection = displayDirection
        pdfView.autoScales = autoScales
        pdfView.pageShadowsEnabled = pageShadowsEnabled
        pdfView.document = document
        return pdfView
    }

    func updateUIView(_ uiView: PDFView, context: Context) {
        // Update document if it changed (reference comparison)
        if uiView.document !== document {
            uiView.document = document
        }

        if uiView.displayMode != displayMode {
            uiView.displayMode = displayMode
        }

        if uiView.autoScales != autoScales {
            uiView.autoScales = autoScales
        }
    }
}

Convenience Initializers

extension PDFViewer {
    /// Load a PDF from a URL (local file or remote).
    init(url: URL, displayMode: PDFDisplayMode = .singlePageContinuous) {
        self.document = PDFDocument(url: url)
        self.displayMode = displayMode
    }

    /// Load a PDF from raw data.
    init(data: Data, displayMode: PDFDisplayMode = .singlePageContinuous) {
        self.document = PDFDocument(data: data)
        self.displayMode = displayMode
    }
}

Usage

struct DocumentView: View {
    let pdfURL: URL

    var body: some View {
        PDFViewer(url: pdfURL)
            .ignoresSafeArea(edges: .bottom)
            .navigationTitle("Document")
            .navigationBarTitleDisplayMode(.inline)
    }
}

With Async Loading

struct RemotePDFView: View {
    let url: URL
    @State private var document: PDFDocument?
    @State private var isLoading = true
    @State private var errorMessage: String?

    var body: some View {
        Group {
            if let document {
                PDFViewer(document: document)
            } else if isLoading {
                ProgressView("Loading PDF...")
            } else if let errorMessage {
                ContentUnavailableView(
                    "Could Not Load PDF",
                    systemImage: "doc.text.fill",
                    description: Text(errorMessage)
                )
            }
        }
        .task {
            do {
                let (data, _) = try await URLSession.shared.data(from: url)
                document = PDFDocument(data: data)
            } catch {
                errorMessage = error.localizedDescription
            }
            isLoading = false
        }
    }
}

PDFView with Page Navigation

struct NavigablePDFView: UIViewRepresentable {
    let document: PDFDocument?
    @Binding var currentPageIndex: Int

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

    func makeUIView(context: Context) -> PDFView {
        let pdfView = PDFView()
        pdfView.displayMode = .singlePageContinuous
        pdfView.autoScales = true
        pdfView.document = document

        NotificationCenter.default.addObserver(
            context.coordinator,
            selector: #selector(Coordinator.pageChanged(_:)),
            name: .PDFViewPageChanged,
            object: pdfView
        )

        return pdfView
    }

    func updateUIView(_ uiView: PDFView, context: Context) {
        if uiView.document !== document {
            uiView.document = document
        }

        // Navigate to page if binding changed externally
        if let doc = uiView.document,
           let page = doc.page(at: currentPageIndex),
           uiView.currentPage != page {
            uiView.go(to: page)
        }
    }

    static func dismantleUIView(_ uiView: PDFView, coordinator: Coordinator) {
        NotificationCenter.default.removeObserver(coordinator)
    }

    final class Coordinator: NSObject {
        var parent: NavigablePDFView

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

        @objc func pageChanged(_ notification: Notification) {
            guard let pdfView = notification.object as? PDFView,
                  let currentPage = pdfView.currentPage,
                  let document = pdfView.document else { return }
            let index = document.index(for: currentPage)
            if parent.currentPageIndex != index {
                parent.currentPageIndex = index
            }
        }
    }
}

Gotchas

• PDFView inherits from UIView. Use UIViewRepresentable, not UIViewControllerRepresentable.
• Document is a reference type. Use !== for identity comparison in updateUIView to avoid unnecessary reloads.
• Page change notifications. Use NotificationCenter with .PDFViewPageChanged -- PDFView does not use a delegate pattern for page changes.
• Remove observers in dismantleUIView. Failing to remove NotificationCenter observers causes crashes after the view is removed.
• autoScales fits the PDF to the view width. Disable it if you want the user to start at a specific zoom level.
• Thread safety. PDFDocument loading can be expensive. Load asynchronously and assign on the main thread.

Docs: PDFView | PDFKit

9. MFMessageComposeViewController Wrapper

Present the system SMS/MMS composer with pre-filled recipients, body, and optional attachments. Companion to Recipe 6 (MFMailComposeViewController).

import SwiftUI
import MessageUI

struct MessageComposer: UIViewControllerRepresentable {
    let recipients: [String]
    let body: String
    var attachments: [MessageAttachment] = []
    var onResult: ((MessageComposeResult) -> Void)?
    @Environment(\.dismiss) private var dismiss

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

    func makeUIViewController(context: Context) -> MFMessageComposeViewController {
        let controller = MFMessageComposeViewController()
        controller.messageComposeDelegate = context.coordinator
        controller.recipients = recipients
        controller.body = body

        for attachment in attachments {
            controller.addAttachmentData(
                attachment.data,
                typeIdentifier: attachment.typeIdentifier,
                filename: attachment.filename
            )
        }

        return controller
    }

    func updateUIViewController(
        _ uiViewController: MFMessageComposeViewController,
        context: Context
    ) {
        // Cannot update message compose after presentation
    }

    final class Coordinator: NSObject, MFMessageComposeViewControllerDelegate {
        let parent: MessageComposer

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

        func messageComposeViewController(
            _ controller: MFMessageComposeViewController,
            didFinishWith result: MessageComposeResult
        ) {
            parent.onResult?(result)
            parent.dismiss()
        }
    }
}

struct MessageAttachment {
    let data: Data
    let typeIdentifier: String // UTI, e.g., "public.jpeg"
    let filename: String
}

Usage

struct InviteView: View {
    @State private var showMessage = false

    var body: some View {
        Button("Send Invite via SMS") {
            guard MFMessageComposeViewController.canSendText() else { return }
            showMessage = true
        }
        .sheet(isPresented: $showMessage) {
            MessageComposer(
                recipients: ["+1234567890"],
                body: "Join me on this app!"
            ) { result in
                switch result {
                case .sent:
                    print("Message sent")
                case .cancelled:
                    print("User cancelled")
                case .failed:
                    print("Message failed")
                @unknown default:
                    break
                }
            }
        }
    }
}

With Image Attachment

struct SharePhotoView: View {
    @State private var showMessage = false
    let image: UIImage

    var body: some View {
        Button("Send Photo") {
            guard MFMessageComposeViewController.canSendText(),
                  MFMessageComposeViewController.canSendAttachments() else {
                return
            }
            showMessage = true
        }
        .sheet(isPresented: $showMessage) {
            MessageComposer(
                recipients: [],
                body: "Check out this photo!",
                attachments: [
                    MessageAttachment(
                        data: image.jpegData(compressionQuality: 0.8) ?? Data(),
                        typeIdentifier: "public.jpeg",
                        filename: "photo.jpg"
                    )
                ]
            )
        }
    }
}

Gotchas

• Check canSendText() before presenting. If it returns false, do not display MFMessageComposeViewController; show fallback UI or disable the message action.
• Check canSendAttachments() before adding attachments. Not all devices or carriers support MMS attachments.
• The delegate protocol is MFMessageComposeViewControllerDelegate, not MFMessageComposeDelegate. It has a single required method.
• Cannot update after presentation. Like MFMailComposeViewController, the message composer API does not support changing fields after the controller is shown.
• iMessage vs. SMS. The controller automatically uses iMessage when available. You cannot force one protocol over the other.
• Simulator limitation. canSendText() returns false on the simulator. Test on a physical device.

Docs: MFMessageComposeViewController | MFMessageComposeViewControllerDelegate