mapbox-ios-patterns

SKILL.md

Mapbox iOS Integration Patterns

Official patterns for integrating Mapbox Maps SDK v11 on iOS with Swift, SwiftUI, and UIKit.

Use this skill when:

Installing and configuring Mapbox Maps SDK for iOS

Adding markers and annotations to maps

Showing user location and tracking with camera

Adding custom data (GeoJSON) to maps

Working with map styles, camera, or user interaction

Handling feature interactions and taps

Official Resources:

iOS Maps Guides

API Reference

Example Apps

Installation & Setup

Requirements

iOS 14+

Xcode 15+

Swift 5.9+

Free Mapbox account

Step 1: Configure Access Token

Add your public token to Info.plist:

<key>MBXAccessToken</key>
<string>pk.your_mapbox_token_here</string>

Get your token: Sign in at mapbox.com

Step 2: Add Swift Package Dependency

File → Add Package Dependencies

Enter URL: https://github.com/mapbox/mapbox-maps-ios.git

Version: "Up to Next Major" from 11.0.0

Verify four dependencies appear: MapboxCommon, MapboxCoreMaps, MapboxMaps, Turf

Alternative: CocoaPods or direct download (install guide)

Map Initialization

SwiftUI Pattern

Basic map:

import SwiftUI
import MapboxMaps

struct ContentView: View {
    @State private var viewport: Viewport = .camera(
        center: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194),
        zoom: 12
    )

    var body: some View {
        Map(viewport: $viewport)
            .mapStyle(.standard)
    }
}

With ornaments:

Map(viewport: $viewport)
    .mapStyle(.standard)
    .ornamentOptions(OrnamentOptions(
        scaleBar: .init(visibility: .visible),
        compass: .init(visibility: .adaptive),
        logo: .init(position: .bottomLeading)
    ))

UIKit Pattern

import UIKit
import MapboxMaps

class MapViewController: UIViewController {
    private var mapView: MapView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let options = MapInitOptions(
            cameraOptions: CameraOptions(
                center: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194),
                zoom: 12
            )
        )

        mapView = MapView(frame: view.bounds, mapInitOptions: options)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        view.addSubview(mapView)

        mapView.mapboxMap.loadStyle(.standard)
    }
}

Add Markers

The SDK offers three ways to place a point on the map. Pick the simplest one that fits.

Which API should I use?

API
Use it when
Platforms
Notes

Marker (Markers API)
You need a default pin and don't have a custom image asset
SwiftUI only
No image assets required. Experimental SPI — needs @_spi(Experimental) import MapboxMaps. Best < 100 markers.

PointAnnotation
You have a custom image and want layer-level placement
SwiftUI + UIKit
Backed by a symbol layer, so it scales well to hundreds of markers. Accepts any UIImage that UIKit can render.

View annotations (ViewAnnotation / MapViewAnnotation)
You want to render a full native view (card, badge, animated content) anchored to a coordinate
SwiftUI + UIKit
SwiftUI uses MapViewAnnotation; UIKit uses mapView.viewAnnotations with a ViewAnnotation. Each annotation is a real view — costs more than PointAnnotation at scale.

For hundreds or thousands of features, use a style layer (SymbolLayer on a GeoJSONSource) instead of annotations.

Markers API (recommended for simple cases, SwiftUI)

import SwiftUI
@_spi(Experimental) import MapboxMaps

struct ContentView: View {
    var body: some View {
        Map {
            Marker(coordinate: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194))
                .color(.red)
                .text("San Francisco")
        }
    }
}

Multiple markers from a collection:

Map {
    ForEvery(locations, id: \.id) { location in
        Marker(coordinate: location.coordinate)
            .color(.red)
            .text(location.name)
    }
}

Scaling note. Marker and PointAnnotation each create their own view or symbol entry per pin — fine up to about 100 markers. For larger datasets (hundreds or thousands of features — common with open-ended GeoJSON feeds), load the data into a GeoJSONSource and render it with a SymbolLayer instead. That scales to thousands of features and enables clustering.

PointAnnotation (custom image)

SwiftUI:

Map(viewport: $viewport) {
    PointAnnotation(coordinate: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194))
        .image(.init(image: UIImage(named: "marker")!, name: "marker"))
}

UIKit:

// Create annotation manager (once, reuse for updates)
var pointAnnotationManager = mapView.annotations.makePointAnnotationManager()

// Create marker
var annotation = PointAnnotation(coordinate: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194))
annotation.image = .init(image: UIImage(named: "marker")!, name: "marker")
annotation.iconAnchor = .bottom

// Add to map
pointAnnotationManager.annotations = [annotation]

Multiple markers:

let annotations = locations.map { coordinate in
    var annotation = PointAnnotation(coordinate: coordinate)
    annotation.image = .init(image: UIImage(named: "marker")!, name: "marker")
    return annotation
}

pointAnnotationManager.annotations = annotations

Show User Location

Step 1: Add location permission to Info.plist:

<key>NSLocationWhenInUseUsageDescription</key>
<string>Show your location on the map</string>

Step 2: Request permissions and show location:

import CoreLocation

// Request permissions
let locationManager = CLLocationManager()
locationManager.requestWhenInUseAuthorization()

// Show user location puck
mapView.location.options.puckType = .puck2D()
mapView.location.options.puckBearingEnabled = true

Performance Best Practices

Reuse Annotation Managers

// ❌ Don't create new managers repeatedly
func updateMarkers() {
    let manager = mapView.annotations.makePointAnnotationManager()
    manager.annotations = markers
}

// ✅ Create once, reuse
let pointAnnotationManager: PointAnnotationManager

init() {
    pointAnnotationManager = mapView.annotations.makePointAnnotationManager()
}

func updateMarkers() {
    pointAnnotationManager.annotations = markers
}

Batch Annotation Updates

// ✅ Update all at once
pointAnnotationManager.annotations = newAnnotations

// ❌ Don't update one by one
for annotation in newAnnotations {
    pointAnnotationManager.annotations.append(annotation)
}

Memory Management

// Use weak self in closures
mapView.gestures.onMapTap.observe { [weak self] context in
    self?.handleTap(context.coordinate)
}.store(in: &cancelables)

// Clean up on deinit
deinit {
    cancelables.forEach { $0.cancel() }
}

Use Standard Style

// ✅ Standard style is optimized and recommended
.mapStyle(.standard)

// Use other styles only when needed for specific use cases
.mapStyle(.standardSatellite) // Satellite imagery

Troubleshooting

Map Not Displaying

Check:

✅ MBXAccessToken in Info.plist

✅ Token is valid (test at mapbox.com)

✅ MapboxMaps framework imported

✅ MapView added to view hierarchy

✅ Correct frame/constraints set

Style Not Loading

mapView.mapboxMap.onStyleLoaded.observe { [weak self] _ in
    print("Style loaded successfully")
    // Add layers and sources here
}.store(in: &cancelables)

Performance Issues

Use .standard style (recommended and optimized)

Limit visible annotations to viewport

Reuse annotation managers

Avoid frequent style reloads

Batch annotation updates

Reference Files

Load these references when the task requires deeper patterns:

references/annotations.md — Circle, Polyline, Polygon Annotations

references/location-tracking.md — Camera Follow User + Get Current Location

references/custom-data.md — GeoJSON: Lines, Polygons, Points, Update/Remove

references/camera-styles.md — Camera Control + Map Styles

references/interactions.md — Featureset Interactions, Custom Layer Taps, Long Press, Gestures

Additional Resources

iOS Maps Guides

API Reference

Interactions Guide

SwiftUI User Guide

Example Apps

Migration Guide (v10 → v11)