Animate Map Style Layer

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//
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//  AnimateMapLayerViewController.swift
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//  maps-ios-demo
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//
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//
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import Foundation
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import UIKit
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import Nbmap
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class AnimateMapLayerViewController: UIViewController {
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    var nbMapView: NGLMapView! {
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        didSet {
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            oldValue?.removeFromSuperview()
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            if let mapView = nbMapView {
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                view.insertSubview(mapView, at: 0)
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                mapView.delegate = self
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            }
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        }
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    }
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    var radarSuffix = 0
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    var points : Array = [CLLocationCoordinate2D]()
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    override func viewDidLoad() {
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        super.viewDidLoad()
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        nbMapView = NGLMapView(frame:self.view.bounds)
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    }
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    func addImageSourceLayer() {
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        let coordinateQuad: NGLCoordinateQuad = NGLCoordinateQuad(
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            topLeft:CLLocationCoordinate2D(latitude: 46.437, longitude: -80.425),
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            bottomLeft:CLLocationCoordinate2D(latitude: 37.936, longitude: -80.425),
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            bottomRight:CLLocationCoordinate2D(latitude: 37.936, longitude: -71.516),
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            topRight: CLLocationCoordinate2D(latitude: 46.437, longitude: -71.516)
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        )
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        let imageSource = NGLImageSource(identifier: "style-image-source-id", coordinateQuad: coordinateQuad, image: UIImage(named: "southeast_radar_0")!)
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        if let source = nbMapView.style?.source(withIdentifier: "style-image-source-id") {
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            nbMapView.style?.removeSource(source)
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        }
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        nbMapView.style?.addSource(imageSource)
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        let rasterLayer = NGLRasterStyleLayer(identifier: "style-raster-image-layer-id", source: imageSource)
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        if let layer = nbMapView.style?.layer(withIdentifier: "style-raster-image-layer-id") {
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            nbMapView.style?.removeLayer(layer)
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        }
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        nbMapView.style?.addLayer(rasterLayer)
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        Timer.scheduledTimer(timeInterval: 0.8, target: self, selector: #selector(updateAnimatedImageSource(_:)), userInfo: imageSource, repeats: true)
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    }
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    @objc func updateAnimatedImageSource(_ timer: Timer) {
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        guard let imageSource = timer.userInfo as? NGLImageSource else { return }
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        let uiImage = UIImage(named: "southeast_radar_\(radarSuffix)")
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        imageSource.setValue(uiImage, forKey: "image")
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        radarSuffix += 1
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        if radarSuffix > 3 {
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            radarSuffix = 0
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        }
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    }
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}
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extension AnimateMapLayerViewController: NGLMapViewDelegate {
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    func mapView(_ mapView: NGLMapView, didFinishLoading style: NGLStyle){
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        nbMapView.setCenter(CLLocationCoordinate2DMake(41.437, -76.425), zoomLevel: 5, animated: true)
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        addImageSourceLayer()
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    }
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}