I'm struggling cause I don't know how to consume this JSON because in the "weather" part of the JSON it receives [0] as key-value and I don't know how to declare it
{
"coord": {
"lon": -35.7353,
"lat": -9.6658
},
"weather": [
{
"id": 801,
"main": "Clouds",
"description": "few clouds",
"icon": "02d"
}
],
"base": "stations",
"main": {
"temp": 302.84,
"feels_like": 305.59,
"temp_min": 302.84,
"temp_max": 302.84,
"pressure": 1011,
"humidity": 61
},
"visibility": 10000,
"wind": {
"speed": 7.2,
"deg": 90
},
"clouds": {
"all": 20
},
"dt": 1672689129,
"sys": {
"type": 1,
"id": 8413,
"country": "BR",
"sunrise": 1672646788,
"sunset": 1672692412
},
"timezone": -10800,
"id": 3395981,
"name": "Maceió",
"cod": 200
}
my attempt looked like this, and it kept failing cause of the weather part. i've tried some stuff like UUID() but none of it seens to work (maybe i'm applying it the wrong way)
import Foundation
struct Response: Codable {
var coord: Coord
var weather: [Weather]?
var main: Main
var visibility: Int
var wind: Wind
var rain: Rain?
var clouds: Clouds?
var dt: Int
var sys: Sys
var timezone: Int
var id: Int
var name: String
var cod: Int
}
struct Coord: Codable {
var lon: Double
var lat: Double
}
struct WeatherBase: Codable {
var id: String { _id }
private var _id: String
var base: String
}
struct Weather: Codable {
var id: Int
var main: String
var description: String
var icon: String
}
struct Main: Codable {
var temp: Double
var feels_like: Double
var temp_min: Double
var temp_max: Double
var pressure: Int
var humidity: Int
}
struct Wind: Codable {
var speed: Double
var deg: Int
}
struct Rain: Codable{
var umh: Int
}
struct Clouds: Codable {
var all: Int
}
struct Sys: Codable {
var type: Int
var id: Int
var country: String
var sunrise: Int
var sunset: Int
}
CodePudding user response：
I couldn't reproduce your error using your code and json object. I just remove the WeatherBase struct because it was not used in any part. I open a playground to understand better you problem and add the following code.
guard let filePath = Bundle.main.url(forResource: "filename", withExtension: "json") else { fatalError()}
let data = try Data(contentsOf: filePath)
let jsonDecoder = JSONDecoder()
jsonDecoder.keyDecodingStrategy = .useDefaultKeys
let jsonData = try? jsonDecoder.decode(Response.self, from: data)
print(token?.weather![0].description)
Result
Optional("few clouds")
I hope I`ve helped you.
CodePudding user response：
As I mentioned in my answer to your previous question,
you need to check the docs to determine which fields are optional
and amend your code accordingly. Note the extra var base: String property in the Response struct.
The following SwiftUi code shows how to access the data
that is retrieved from the openweathermap server, in particular the weather info.
Use something similar for your UIKit code.
Note that you must check the index before you access the data, as shown, otherwise your app will crash.
struct ContentView: View {
@State var result: Response?
var body: some View {
VStack {
// the base property
Text(result?.base ?? "no base").foregroundColor(.blue)
// check index first
if let kount = result?.weather?.count, kount > 0 {
Text(result?.weather![0].description ?? "no data")
Text(result?.weather![0].main ?? "no data")
Text(result?.weather![0].icon ?? "no data")
} else {
Text("no data for weather[0]").foregroundColor(.red)
}
// or
if let kount = result?.weather?.count, kount > 1 {
Text(result?.weather![1].description ?? "no data")
Text(result?.weather![1].main ?? "no data")
Text(result?.weather![1].icon ?? "no data")
} else {
Text("no data for weather[1]").foregroundColor(.red)
}
}
.onAppear {
downloadJSON { error in
if error == nil {
print("success")
// checks
if let theResult = result, let kount = theResult.weather?.count, kount > 0 {
print("---> base: \(theResult.base)")
print("---> description: \(theResult.weather![0].description)")
print("---> main: \(theResult.weather![0].main)")
print("---> icon: \(theResult.weather![0].icon)")
}
// alternative checks
if let theResult = result, let firstWeather = theResult.weather?.first {
print("---> base: \(theResult.base)")
print("---> description: \(firstWeather.description)")
print("---> main: \(firstWeather.main)")
print("---> icon: \(firstWeather.icon)")
}
} else {
print("error: \(error)")
}
}
}
}
func downloadJSON(completed: @escaping (Error?) -> ()){
let token = "YOUR-TOKEN"
if let url = URL(string: "https://api.openweathermap.org/data/2.5/weather?appid=\(token)&q=Maceio") {
URLSession.shared.dataTask(with: url) { data, response, error in
if error == nil, let data = data {
do {
self.result = try JSONDecoder().decode(Response.self, from: data)
completed(nil)
}
catch {
completed(error)
}
}
}.resume()
}
}
}
struct Response: Codable, Identifiable { // <-- here
var base: String // <-- here
var coord: Coord
var weather: [Weather]? // <-- here
var main: Main?
var visibility: Int?
var wind: Wind?
var rain: Rain?
var clouds: Clouds?
var dt: Int?
var sys: Sys?
var timezone: Int?
var id: Int?
var name: String?
var cod: Int?
}
struct Coord: Codable {
var lon: Double?
var lat: Double?
}
struct Weather: Codable, Identifiable { // <-- here
var id: Int
var main: String
var description: String
var icon: String
}
struct Main: Codable {
var temp: Double?
var feels_like: Double?
var temp_min: Double?
var temp_max: Double?
var pressure: Int?
var humidity: Int?
}
struct Wind: Codable {
var speed: Double?
var deg: Int?
}
struct Rain: Codable{
var umh: Int?
}
struct Clouds: Codable {
var all: Int?
}
struct Sys: Codable {
var type: Int?
var id: Int?
var country: String?
var sunrise: Int?
var sunset: Int?
}