Custom renderer

ViewController.swift

    // Change the web map renderer to a customised one
    private func changeFeatureLayerRenderers(for map: AGSMap) {
        
        // Get the feature layer containing the munro mountains point data
        if let munroLayer = map.operationalLayers.object(at: 1) as? AGSFeatureLayer {
            // Turn off labels
            munroLayer.labelsEnabled = false
            // Create custom renderer from mountains.png
            let munroSymbol = AGSPictureMarkerSymbol(image: UIImage(named: "mountains")!)
            munroSymbol.height = 40
            munroSymbol.width = 40
            munroLayer.renderer = AGSSimpleRenderer(symbol: munroSymbol)
        }
        
        // Get the feature layer containing the national park polygon data
        if let parkLayer = map.operationalLayers.object(at: 0) as? AGSFeatureLayer {
            let parkLineSymbol = AGSSimpleLineSymbol(style: .solid, color: UIColor.black, width: 1)
            let parkSymbol = AGSSimpleFillSymbol(style: .null, color: UIColor.clear, outline: parkLineSymbol)
            // Create custom renderer
            parkLayer.renderer = AGSSimpleRenderer(symbol: parkSymbol)
        }
    }