Animate Map Style Layer

1//
2//  AnimateMapLayerViewController.swift
3//  maps-ios-demo
4//
5//
6import Foundation
7import UIKit
8import Nbmap
9class AnimateMapLayerViewController: UIViewController {
10    
11    var nbMapView: NGLMapView! {
12        didSet {
13            oldValue?.removeFromSuperview()
14            if let mapView = nbMapView {
15                view.insertSubview(mapView, at: 0)
16                mapView.delegate = self
17            }
18        }
19    }
20    var radarSuffix = 0
21    
22    var points : Array = [CLLocationCoordinate2D]()
23    
24    override func viewDidLoad() {
25        super.viewDidLoad()
26        nbMapView = NGLMapView(frame:self.view.bounds)
27    }
28    
29    func addImageSourceLayer() {
30        let coordinateQuad: NGLCoordinateQuad = NGLCoordinateQuad(
31            topLeft:CLLocationCoordinate2D(latitude: 46.437, longitude: -80.425),
32            bottomLeft:CLLocationCoordinate2D(latitude: 37.936, longitude: -80.425),
33            bottomRight:CLLocationCoordinate2D(latitude: 37.936, longitude: -71.516),
34            topRight: CLLocationCoordinate2D(latitude: 46.437, longitude: -71.516)
35        )
36        
37        let imageSource = NGLImageSource(identifier: "style-image-source-id", coordinateQuad: coordinateQuad, image: UIImage(named: "southeast_radar_0")!)
38        if let source = nbMapView.style?.source(withIdentifier: "style-image-source-id") {
39            nbMapView.style?.removeSource(source)
40        }
41        nbMapView.style?.addSource(imageSource)
42        let rasterLayer = NGLRasterStyleLayer(identifier: "style-raster-image-layer-id", source: imageSource)
43        if let layer = nbMapView.style?.layer(withIdentifier: "style-raster-image-layer-id") {
44            nbMapView.style?.removeLayer(layer)
45        }
46                                               
47        nbMapView.style?.addLayer(rasterLayer)
48        Timer.scheduledTimer(timeInterval: 0.8, target: self, selector: #selector(updateAnimatedImageSource(_:)), userInfo: imageSource, repeats: true)
49    }
50    
51    @objc func updateAnimatedImageSource(_ timer: Timer) {
52        guard let imageSource = timer.userInfo as? NGLImageSource else { return }
53        let uiImage = UIImage(named: "southeast_radar_\(radarSuffix)")
54        imageSource.setValue(uiImage, forKey: "image")
55        radarSuffix += 1
56        if radarSuffix > 3 {
57            radarSuffix = 0
58        }
59    }
60    
61}
62extension AnimateMapLayerViewController: NGLMapViewDelegate {
63    func mapView(_ mapView: NGLMapView, didFinishLoading style: NGLStyle){
64        
65        nbMapView.setCenter(CLLocationCoordinate2DMake(41.437, -76.425), zoomLevel: 5, animated: true)
66        addImageSourceLayer()
67    }
68}