// let geoPackageFile: String = ...
// let mapView: MKMapView = ...

// Get a manager
let manager: GPKGGeoPackageManager = GPKGGeoPackageFactory.manager()

// Available databases
let databases: NSArray = manager.databases() as NSArray

// Import database
let imported: Bool = manager.importGeoPackage(fromPath: geoPackageFile)

// Open database
let geoPackage: GPKGGeoPackage = manager.open(databases.object(at: 0) as? String)

// GeoPackage Table DAOs
let srsDao: GPKGSpatialReferenceSystemDao = geoPackage.spatialReferenceSystemDao()
let contentsDao: GPKGContentsDao = geoPackage.contentsDao()
let geometryColumnsDao: GPKGGeometryColumnsDao = geoPackage.geometryColumnsDao()
let tileMatrixSetDao: GPKGTileMatrixSetDao = geoPackage.tileMatrixSetDao()
let tileMatrixDao: GPKGTileMatrixDao = geoPackage.tileMatrixDao()
let schemaExtension : GPKGSchemaExtension = GPKGSchemaExtension.init(geoPackage: geoPackage)
let dataColumnsDao: GPKGDataColumnsDao = schemaExtension.dataColumnsDao()
let dataColumnConstraintsDao: GPKGDataColumnConstraintsDao = schemaExtension.dataColumnConstraintsDao()
let metadataExtension : GPKGMetadataExtension = GPKGMetadataExtension.init(geoPackage: geoPackage)
let metadataDao: GPKGMetadataDao = metadataExtension.metadataDao()
let metadataReferenceDao: GPKGMetadataReferenceDao = metadataExtension.metadataReferenceDao()
let extensionsDao: GPKGExtensionsDao = geoPackage.extensionsDao()

// Feature and tile tables
let features: NSArray = geoPackage.featureTables() as NSArray
let tiles: NSArray = geoPackage.tileTables() as NSArray

// Query Features
let featureTable: String = features.object(at: 0) as! String
let featureDao: GPKGFeatureDao = geoPackage.featureDao(withTableName: featureTable)
let converter: GPKGMapShapeConverter = GPKGMapShapeConverter(projection: featureDao.projection)
let featureResults: GPKGResultSet = featureDao.queryForAll()
do{
    defer{featureResults.close()}
    while(featureResults.moveToNext()){
        let featureRow: GPKGFeatureRow = featureDao.featureRow(featureResults)
        let geometryData: GPKGGeometryData! = featureRow.geometry()
        if(geometryData != nil && !geometryData.empty){
            let geometry: SFGeometry = geometryData.geometry
            let shape: GPKGMapShape = converter.toShape(with: geometry)
            let mapShape = GPKGMapShapeConverter.add(shape, to: mapView)
            // ...
        }
    }
}

// Query Tiles
let tileTable: String = tiles.object(at: 0) as! String
let tileDao: GPKGTileDao = geoPackage.tileDao(withTableName: tileTable)
let tileResults: GPKGResultSet = tileDao.queryForAll()
do{
    defer{tileResults.close()}
    while(tileResults.moveToNext()){
        let tileRow: GPKGTileRow = tileDao.tileRow(tileResults)
        let tileData: Data = tileRow.tileData()
        let tileImage: UIImage = tileRow.tileDataImage()
        // ...
    }
}

// Retrieve Tiles by XYZ
let retriever = GPKGGeoPackageTileRetriever()
let geoPackageTile: GPKGGeoPackageTile! = retriever.tileWith(x: 2, andY: 2, andZoom: 2)
if(geoPackageTile != nil){
    let tileData: Data = geoPackageTile.data
    let tileImage: UIImage = GPKGImageConverter.toImage(tileData)
    // ...
}

// Retrieve Tiles by Bounding Box
let tileCreator: GPKGTileCreator = GPKGTileCreator(tileDao: tileDao, andProjection: PROJProjectionFactory.projection(withEpsgInt: PROJ_EPSG_WORLD_GEODETIC_SYSTEM))
let geoPackageTile2: GPKGGeoPackageTile! = tileCreator.tile(with: GPKGBoundingBox(minLongitudeDouble: -90.0, andMinLatitudeDouble: 0.0, andMaxLongitudeDouble: 0.0, andMaxLatitudeDouble: 66.513260))
if(geoPackageTile2 != nil){
    let tileData: Data = geoPackageTile2.data
    let tileImage: UIImage = GPKGImageConverter.toImage(tileData)
    // ...
}

// Tile Overlay (GeoPackage or Standard API)
let tileOverlay: MKTileOverlay = GPKGOverlayFactory.tileOverlay(with: tileDao)
tileOverlay.canReplaceMapContent = false
mapView.addOverlay(tileOverlay)

let boundingBox: GPKGBoundingBox = GPKGBoundingBox.worldWebMercator()
let projection: PROJProjection = PROJProjectionFactory.projection(withEpsgInt: PROJ_EPSG_WEB_MERCATOR)

// Index Features
let indexer: GPKGFeatureIndexManager = GPKGFeatureIndexManager(geoPackage: geoPackage, andFeatureDao: featureDao)
indexer.indexLocation = GPKG_FIT_RTREE
let indexedCount = indexer.index()

// Query Indexed Features in paginated chunks
let indexResults: GPKGFeatureIndexResults = indexer.queryForChunk(with: boundingBox, in: projection, andLimit: 50)
let paginatedResults: GPKGRowPaginatedResults = indexer.paginate(indexResults)
do{
    defer{paginatedResults.close()}
    while(paginatedResults.moveToNext()){
        let featureRow: GPKGFeatureRow = paginatedResults.userRow() as! GPKGFeatureRow
        let geometryData: GPKGGeometryData! = featureRow.geometry()
        if(geometryData != nil && !geometryData.empty){
            let geometry: SFGeometry = geometryData.geometry
            // ...
        }
    }
}

// Feature Tile Overlay (dynamically draw tiles from features)
let featureTiles: GPKGFeatureTiles = GPKGFeatureTiles(featureDao: featureDao)
featureTiles.maxFeaturesPerTile = 1000
let numberFeaturesTile: GPKGNumberFeaturesTile = GPKGNumberFeaturesTile()
featureTiles.maxFeaturesTileDraw = numberFeaturesTile
featureTiles.indexManager = indexer
let featureOverlay: GPKGFeatureOverlay! = GPKGFeatureOverlay(featureTiles: featureTiles)
featureOverlay.minZoom = NSNumber(value:featureDao.zoomLevel())
mapView.addOverlay(featureOverlay!)

// URL Tile Generator (generate tiles from a URL)
let urlTileGenerator: GPKGTileGenerator = GPKGUrlTileGenerator(geoPackage: geoPackage, andTableName: "url_tile_table", andTileUrl: "http://url/{z}/{x}/{y}.png", andMinZoom: 1, andMaxZoom: 2, andBoundingBox:boundingBox, andProjection:projection)
let urlTileCount: Int32 = urlTileGenerator.generateTiles()

// Feature Tile Generator (generate tiles from features)
let featureTileGenerator: GPKGTileGenerator = GPKGFeatureTileGenerator(geoPackage: geoPackage, andTableName: featureTable + "_tiles", andFeatureTiles: featureTiles, andMinZoom: 1, andMaxZoom: 2, andBoundingBox:boundingBox, andProjection:projection)
let featureTileCount: Int32 = featureTileGenerator.generateTiles()

// Close database when done
geoPackage.close()

// Close manager when done
manager.close()