guard let sdkNativeEngine = SDKNativeEngine.sharedInstance else {
    fatalError("SDKNativeEngine not initialized.")
}

// Create MapUpdater in background to not block the UI thread.
MapUpdater.fromEngineAsync(sdkNativeEngine, { mapUpdater in
    let mapUpdaterInstance = mapUpdater
    // Use the instance ...
})

guard let sdkNativeEngine = SDKNativeEngine.sharedInstance else {
    fatalError("SDKNativeEngine not initialized.")
}

// Create MapUpdater in background to not block the UI thread.
MapUpdater.fromEngineAsync(sdkNativeEngine, { mapUpdater in
    let mapUpdaterInstance = mapUpdater

    do {
        let mapVersionHandle = try mapUpdaterInstance.getCurrentMapVersion()
        let versionInfo = mapVersionHandle.stringRepresentation(separator: ",")
        print("Info: \(String(describing: versionInfo))")
    } catch let mapLoaderException {
        fatalError("Get current map version failed: \(mapLoaderException.localizedDescription)")
    }
})

private func checkForMapUpdates() {
    guard let mapUpdater = mapUpdater else {
        showMessage("MapUpdater instance not ready. Try again.")
        return
    }

    _ = mapUpdater.retrieveCatalogsUpdateInfo(callback: onCatalogUpdateCompleted)
}

// Completion handler to get notified whether a catalog update is available or not.
private func onCatalogUpdateCompleted(mapLoaderError: MapLoaderError?, catalogList: [CatalogUpdateInfo]?) {
    if let error = mapLoaderError {
        print("CatalogUpdateCheck Error: \(error)")
        return
    }

    // When error is nil, then the list is guaranteed to be not nil.
    if catalogList!.isEmpty {
        print("CatalogUpdateCheck: No map updates are available.");
    }

    logCurrentSDKVersion();
    logCurrentMapVersion();

    for catalogUpdateInfo in catalogList! {
        print("CatalogUpdateCheck - Catalog name:" + catalogUpdateInfo.installedCatalog.catalogIdentifier.hrn);
        print("CatalogUpdateCheck - Installed map version: \(String(describing: catalogUpdateInfo.installedCatalog.catalogIdentifier.version))");
        print("CatalogUpdateCheck - Latest available map version: \(catalogUpdateInfo.latestVersion)");
        performMapUpdate(catalogUpdateInfo: catalogUpdateInfo);
    }
}

// Downloads and installs map updates for any of the already downloaded regions.
// Note that this example only shows how to download one region.
private func performMapUpdate(catalogUpdateInfo: CatalogUpdateInfo) {
    guard let mapUpdater = mapUpdater else {
        showMessage("MapUpdater instance not ready. Try again.")
        return
    }

    // This method conveniently updates all installed regions if an update is available.
    // Optionally, you can use the returned CatalogUpdateTask to pause / resume or cancel the update.
    _ = mapUpdater.updateCatalog(catalogInfo: catalogUpdateInfo, completion: catalogUpdateListenerImpl)
}

private let catalogUpdateListenerImpl = CatalogUpdateListenerImpl()

private class CatalogUpdateListenerImpl : CatalogUpdateProgressListener {
    // Conform to the CatalogUpdateProgressListener protocol.
    func onPause(error: heresdk.MapLoaderError?) {
        if let mapLoaderError = error {
            print("Catalog update onPause error. The task tried to often to retry the update: \(mapLoaderError).")
        } else {
            print("CatalogUpdate: The map update was paused by the user calling catalogUpdateTask.pause().")
        }
    }

    // Conform to the CatalogUpdateProgressListener protocol.
    func onProgress(region: RegionId, percentage: Int32) {
        print("CatalogUpdate: Downloading and installing a map update. Progress for \(region.id): \(percentage)%.")
    }

    // Conform to the CatalogUpdateProgressListener protocol.
    func onComplete(error: MapLoaderError?) {
        if let mapLoaderError = error {
            print("CatalogUpdate completion error: \(mapLoaderError)")
            return
        }
        print("CatalogUpdate: One or more map update has been successfully installed.")

        // It is recommend to call now also `getDownloadableRegions()` to update
        // the internal catalog data that is needed to download, update or delete
        // existing `Region` data. It is required to do this at least once
        // before doing a new download, update or delete operation.
    }

    // Conform to the CatalogUpdateProgressListener protocol.
    func onResume() {
        print("MapUpdate: A previously paused map update has been resumed.")
    }
}