How create a usable data object - swift

Question

I have swiftyJSON added as a package dependancy and have the appropriate import statement.
My JSON file has the following format:
"00AK": {
"icao": "00AK",
"iata": "",
"name": "Lowell Field",
"city": "Anchor Point",
"state": "Alaska",
"country": "US",
"elevation": 450,
"lat": 59.94919968,
"lon": -151.695999146,
"tz": "America\/Anchorage"
},
"00AL": {
"icao": "00AL",
"iata": "",
"name": "Epps Airpark",
"city": "Harvest",
"state": "Alabama",
"country": "US",
"elevation": 820,
"lat": 34.8647994995,
"lon": -86.7703018188,
"tz": "America\/Chicago"
etc. And the JSON file is stored within the app bundle
This is the code I have currently:
import SwiftUI
import SwiftyJSON
let path = Bundle.main.url(forResource: "airports", withExtension: "json")
let jsonString = try? String(contentsOf: path!)
let dataFromString = jsonString!.data
let json = JSON(data: dataFromString)
This gives me the error on the last line of....
"Cannot convert value of type ' (String.Encoding, Bool) -> Data?' to expected argument type 'Data'"
If I 'mouseover' the jsonString var the tooltip shows me the correct string from the file, but I don't understand why the next bit just isn't working.

Answer 1

Your problem seems to be related to convert to Data, this is how I would read the file and convert to Data
let url = Bundle.main.url(forResource: "airports", withExtension: "json")!
let jsonString = try! String(contentsOf: url)
let dataFromString = jsonString.data(using: .utf8)!
To move on here is a simplified example how you can use Codable for your json
struct Airport: Codable {
let icao: String
let name: String
let city: String
let country: String
let elevation: Int
let latitude: Double
let longitude: Double
enum CodingKeys: String, CodingKey {
case latitude = "lat"
case longitude = "lon"
case icao, name, city, country, elevation
}
}
do {
let result = try JSONDecoder().decode([String: Airport].self, from: dataFromString)
let airports = result.values
print(airports)
} catch {
print(error)
}
Note that I did not include all fields here and also made some assumptions what the file content looked like since you have only included a part of it.