Download map tiles within a polygonal area - Swift SDK

The MapTiler SDK for iOS provides a powerful Offline Pack API that allows you to download tiles within a polygonal area defined by a GeoJSON Polygon for use without an active internet connection.

Before you begin, ensure you have followed the iOS Getting Started with Offline Pack API to set up your project and obtain your API key.

Offline Pack for a Polygon (GeoJSON Polygon)

import MapTilerSDK

// Your GeoJSON Polygon
let polygonGeoJSON = """
{
    "type": "Polygon",
    "coordinates": [[
        [8.5417, 47.3769],
        [8.5457, 47.3769],
        [8.5457, 47.3799],
        [8.5417, 47.3799],
        [8.5417, 47.3769]
    ]]
}
"""

Task {
    do {
        // Extract coordinates from GeoJSON
        let polyCoords = try MTGeoJSONParser.extractCoordinates(from: polygonGeoJSON)
        
        // Create the polygon definition
        let polyDefinition = MTOfflineRegionDefinition(
            geometry: .polygon(polyCoords),
            minZoom: 1,
            maxZoom: 12,
            referenceStyle: .streets
        )
        
        // Create and download the pack
        let pack = try await MTOfflinePack.createPack(region: polyDefinition)
        await pack.download()
        print("Polygon download started")
    } catch {
        print("Error: \(error)")
    }
}

Learn more

For more information browse our API Reference

Check out our SDK Swift Examples.