Swift weather data from Openweathermap API? - json

Question

From openweathermap api, I am getting below response.
{
"cod":"200",
"message":0,
"cnt":40,
"list":[
{
"dt":1587643200,
"main":{
"temp":289.78,
"feels_like":283.61,
"temp_min":289.03,
"temp_max":289.78,
"pressure":1014,
"sea_level":1014,
"grnd_level":1010,
"humidity":41,
"temp_kf":0.75
},
"weather":[
{
"id":804,
"main":"Clouds",
"description":"overcast clouds",
"icon":"04d"
}
],
"clouds":{
"all":94
},
"wind":{
"speed":6.75,
"deg":2
},
"sys":{
"pod":"d"
},
"dt_txt":"2020-04-23 12:00:00"
},
{
"dt":1587654000,
"main":{
"temp":289.66,
"feels_like":284.44,
"temp_min":289.34,
"temp_max":289.66,
"pressure":1013,
"sea_level":1013,
"grnd_level":1009,
"humidity":47,
"temp_kf":0.32
},
"weather":[
{
"id":803,
"main":"Clouds",
"description":"broken clouds",
"icon":"04d"
}
],
"clouds":{
"all":67
},
"wind":{
"speed":5.9,
"deg":357
},
"sys":{
"pod":"d"
},
"dt_txt":"2020-04-23 15:00:00"
}
Then I write the code below to get wind data for any specific daytime(dt). I get the jsonresponse to the Any "list". But I can't get the wind data. I get the error
"Value of type 'Any' has no subscripts".
Also, I can't understand how can I get the wind data for dt=1587643200 and dt=1587654000 separately.
if let list = jsonresponse["list"] as? Any {
let wind = list["wind"] as? [String : Any],
print(wind)
}

Answer 1

This is a super simple example, this question is similar to your problem. I would like that you learn about Codable protocol to simplify and improve your code because of this way is super creepy.
let url = URL(string: "https://samples.openweathermap.org/data/2.5/history/city?id=2885679&type=hour&appid=b1b15e88fa797225412429c1c50c122a1")!
URLSession.shared.dataTask(with: url, completionHandler: {(data, response, error) in
if let error = error {
print(error.localizedDescription)
return
}
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode) else {
print("Error with the response, unexpected status code: \(String(describing: response))")
return
}
guard let data = data else {
return
}
guard let dictionaryObj = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else {
return
}
guard let list = dictionaryObj["list"] as? [[String: Any]] else {
return
}
if let first = list.first, let wind = first["wind"] {
print(wind)
}
}).resume()

Answer 2

Incase anyone further needs help, I wrote a small code segment—using Swift Codables—to get this done.
Note that I'm using Higher Order Functions in Swift to filter & print the required values. You can follow this tutorial if you need to know more about how they work..
let urlNew = "https://samples.openweathermap.org/data/2.5/history/city?id=2885679&type=hour&appid=b1b15e88fa797225412429c1c50c122a1"
struct WeatherResponse: Codable {
let message: String
let cod: String
let city_id: Int
let calctime: Double
let cnt: Int
let list: [WeatherCompositeObject]
struct WeatherCompositeObject: Codable {
let main: WeatherMainObject
let wind: WeatherWindObject
let clouds: WeatherCloudObject
let weather: [WeatherObject]
let dt: Int
struct WeatherMainObject: Codable {
let temp: Double
let humidity: Int
//You can add the other parameters as needed here
}
struct WeatherWindObject: Codable {
let speed: Double
let deg: Double
}
struct WeatherCloudObject: Codable {
let all: Int
}
struct WeatherObject: Codable {
let id: Int
let main: String
let description: String
}
}
}
class ApiContentDownloader {
func getCurrentWeather(url: String) {
URLSession.shared.dataTask(with: URL(string: url)!) { data, urlResponse, error in
let parser = ContentParser()
let result = parser.parseData(data: data!)
if let result = result {
print("Weather: \(result.message)")
print("DT values: \(result.list.map({ $0.dt})) ")
print("Wind values: \(result.list.map({ $0.wind.speed})) ")
print("Weather descriptions: \(result.list.map({ $0.weather.map( {$0.description} )})) ")
}
else {
print("Oops... Error occured")
}
}.resume()
}
}
class ContentParser {
func parseData(data: Data) -> WeatherResponse? {
var result: WeatherResponse? = nil
do {
let json = try JSONDecoder().decode(WeatherResponse.self, from: data)
result = json
}
catch {
print(error.localizedDescription)
}
return result
}
}
let downloader = ApiContentDownloader()
downloader.getCurrentWeather(url: urlNew)