override func viewDidLoad() {

super.viewDidLoad()

if let localData = self.readLocalFile(forName: "data") {

self.parse(jsonData: localData)

}

let urlString = "https://raw.githubusercontent.com/programmingwithswift/ReadJSONFileURL/master/hostedDataFile.json"

self.loadJson(fromURLString: urlString) { (result) in

switch result {

case .success(let data):

self.parse(jsonData: data)

case .failure(let error):

print(error)

}

}

// Do any additional setup after loading the view.

}

private func readLocalFile(forName name: String) -> Data? {

do {

if let bundlePath = Bundle.main.path(forResource: name,

ofType: "json"),

let jsonData = try String(contentsOfFile: bundlePath).data(using: .utf8) {

return jsonData

}

} catch {

print(error)

}

return nil

}

private func loadJson(fromURLString urlString: String,

completion: @escaping (Result<Data, Error>) -> Void) {

if let url = URL(string: urlString) {

let urlSession = URLSession(configuration: .default).dataTask(with: url) { (data, response, error) in

if let error = error {

completion(.failure(error))

}

if let data = data {

completion(.success(data))

}

}

urlSession.resume()

}

}

private func parse(jsonData: Data) {

do {

let decodedData = try JSONDecoder().decode(DemoData.self,

from: jsonData)

print("Title: ", decodedData.title)

print("Description: ", decodedData.description)

print("===================================")

} catch {

print("decode error")

}

}