Aqui estou usando o arquivo geojson para obter uma matriz 2D para desenhar linhas. Não pude anexar a dimensão 2D, ao anexá-la se converte em uma matriz dimensional únic

aqui é a saída que tenho:

coordArray==[[80.2226534485817, 12.871137160770251], [80.22263333201408, 
12.871145658917484], [80.22264339029789, 12.871184881131773], [80.2225998044014, 
12.871194686684378], [80.22260718047619, 12.87121625889878], [80.22256962954998,     12.87123848481471], [80.22255957126617, 
12.871204819088353], [80.22259946912527, 12.871195013536129], 
[80.22264305502176, 12.871184881131773], [80.22263266146183, 
12.871145658917484], [80.22265445441008, 12.871135526511145]]

Aqui está uma estrutura que eu usei:

struct Geodata: Codable {
let type: String
let features: [Feature]
}

struct Feature: Codable {
let type: String
let properties: Properties
let geometry: Geometry
}

struct Geometry: Codable {
let type: String
let coordinates: [[Double]]
}

struct Properties: Codable {
let name: String?
}

Aqui está a variável que declarei para a tableview. Here I have declared two called nameArrayand coordatesArraywhich I need to use in tableview`.

 var nameArray = [String]()

var coordinatesArray = [[Double]]()

Aqui está o código para extrair o valor geojson:

     func loadGeoJson() {


    guard let jsonUrl = Bundle.main.url(forResource: "map1", withExtension: "geojson") else { return }

    guard let jsonData = try? Data(contentsOf: jsonUrl) else { return }

    self.drawPolyline(geoJson: jsonData)

    URLSession.shared.dataTask(with: jsonUrl) { (data, response, error) in
        if error != nil {
            print(error!.localizedDescription)
        }

        guard let data = data else { return }


        do {
            //Decode retrived data with JSONDecoder and assing type of Article object
            let baseData = try JSONDecoder().decode(Geodata.self, from: data)


            for featu in baseData.features {
                self.nameArray.append(featu.properties.name!)
                print("nameArray==\(self.nameArray)")


            }

            for coor in baseData.features {



                self.coordinatesArray.append(contentsOf: coor.geometry.coordinates)

                print("new coor::\(coor.geometry.coordinates)")

                    print("coordArray==\(self.coordinatesArray)")
            }


        } catch let jsonError {
            print(jsonError)
    }

        DispatchQueue.main.async {
            self.tableView.reloadData()
   }

}.resume()


}

aqui está meu arquivo geojson:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "name": "Dot2Globe - CZSM"
      },
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [
            80.2226534485817,
            12.871137160770251
          ],
          [
            80.22263333201408,
            12.871145658917484
          ],
          [
            80.22264339029789,
            12.871184881131773
          ],
          [
            80.2225998044014,
            12.871194686684378
          ],
          [
            80.22260718047619,
            12.87121625889878
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "name": "Entrance - CZSM"
      },
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [
            80.22256962954998,
            12.87123848481471
          ],
          [
            80.22255957126617,
            12.871204819088353
          ],
          [
            80.22259946912527,
            12.871195013536129
          ],
          [
            80.22264305502176,
            12.871184881131773
          ],
          [
            80.22263266146183,
            12.871145658917484
          ],
          [
            80.22265445441008,
            12.871135526511145
          ]
        ]
      }
    }
  ]
}