Swift is not printing or displaying name in App from a weather API? - swift

Question

if let jsonObj = jsonObj as? [String: Any],
let weatherDictionary = jsonObj["weather"] as? [String: Any],
let weather = weatherDictionary["description", default: "clear sky"] as?
NSDictionary {
print("weather")
DispatchQueue.main.async {
self.conditionsLabel.text = "\(weather)"
}
}
// to display weather conditions in "name" from Open Weather
"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01n"}]
//No errors, but code is not printing or displaying in App.

Answer 1

I'm not sure how to help with your exact question unless you can provide some more code for context. However,
You might try using the built-in decoding that comes with Swift 4. Check it out here. Basically, you make a class that models the response object, like this:
struct Weather: Decodable {
var id: Int
var main: String
var description: String
var icon: String
}
Then decode it like so:
let decoder = JSONDecoder()
let weather = try decoder.decode(Weather.self, from: jsonObj)
And it magically decodes into the data you need! Let me know if that doesn't work, and comment if you have more code context for your problem that I can help with.

Answer 2

I put the complete demo here to show how to send a HTTP request and parse the JSON response.
Note, Configure ATS if you use HTTP request, rather than HTTPS request.
The demo URL is "http://samples.openweathermap.org/data/2.5/forecast?q=M%C3%BCnchen,DE&appid=b6907d289e10d714a6e88b30761fae22".
The JSON format is as below, and the demo shows how to get the city name.
{
cod: "200",
message: 0.0032,
cnt: 36,
list: [...],
city: {
id: 6940463,
name: "Altstadt",
coord: {
lat: 48.137,
lon: 11.5752
},
country: "none"
}
}
The complete demo is as below. It shows how to use URLSessionDataTask and JSONSerialization.
class WeatherManager {
static func sendRequest() {
guard let url = URL(string: "http://samples.openweathermap.org/data/2.5/forecast?q=M%C3%BCnchen,DE&appid=b6907d289e10d714a6e88b30761fae22") else {
return
}
// init dataTask
let dataTask = URLSession.shared.dataTask(with: url) { (data, response, error) in
let name = WeatherManager.cityName(fromWeatherData: data)
print(name ?? "")
}
// send the request
dataTask.resume()
}
private static func cityName(fromWeatherData data: Data?) -> String? {
guard let data = data else {
print("data is nil")
return nil
}
do {
// convert Data to JSON object
let jsonObject = try JSONSerialization.jsonObject(with: data, options: [])
print(jsonObject)
if let jsonObject = jsonObject as? [String: Any],
let cityDic = jsonObject["city"] as? [String: Any],
let name = cityDic["name"] as? String {
return name
} else {
return nil
}
} catch {
print("failed to get json object")
return nil
}
}
}