How can I parse an array into the json on Swift? - ios

Question

I need to take the value "maxtemp_c" from the json request, but it didn't work.
This is what I've do, It will block when I try to parse the json and the value is nil
//url of the json
let url = URL(string: "http://api.apixu.com/v1/forecast.json?key=6cffef39633d4489a0e101339171811&q=Loria&days=3")!
let taskfor = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print("some error occured")
} else {
if error == nil {
do{
let jsonResult = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String : AnyObject]
let forecast = jsonResult["forecast"] as? [String : AnyObject]
// I would not recommend to use NSDictionary, try using Swift types instead
guard let forecastday = forecast!["forecastday"] as? [[String:Any]] else { return }
// Check for the weather parameter as an array of dictionaries and than excess the first array's description
var finalArray:[Any] = []
//now I try to parse the json but the result is nil
for result in forecastday {
if let dict = result as? [String: Any], let forecastday = dict["day"] as? [String] {
finalArray.append(forecastday)
}
}
print(finalArray)
}catch {
print("JSON Preocessing failed")
}
}
}
}
taskfor.resume()
and this is the json that I have to parse
"forecast": {
"forecastday": [ //this is the problem that the value is nil
{
"date": "2017-11-26",
"date_epoch": 1511654400,
"day": {
"maxtemp_c": 7.3, //this is the value that I need

Answer 1

Looks like "day" key contains Dictionary not Array, just change it to [String: Any] from [String]
for result in forecastday {
if let dict = result as? [String: Any], let forecastday = dict["day"] as? [String: Any] {
finalArray.append(forecastday)
}
}
If you want just "maxtemp_c" array then declare final array as [Double] and add a check for "maxtemp_c" in the end
if let forecastday = forecast["forecastday"] as? [[String: Any]] {
var finalArray: [Double] = []
for result in forecastday {
if let dict = result as? [String: Any], let forecastday = dict["day"] as? [String: Any], let temp = forecastday["maxtemp_c"] as? Double {
finalArray.append(temp)
}
}
print(finalArray)
}
If you want "maxtemp_c" in [String] format then do
finalArray.append(String(format: "%.1f", temp))