Swift JSON Parsing Wunderground - json

Question

i am a beginner with swift an Progrmamming i need values from the JSON it looks Like this:
{
"response": {
"version":"0.1",
"termsofService":"http://www.wunderground.com/weather/api/d/terms.html",
"features": {
"astronomy": 1
}
}
, "moon_phase": {
"percentIlluminated":"23",
"ageOfMoon":"5",
"phaseofMoon":"Erstes Viertel",
"hemisphere":"North",
"current_time": {
"hour":"8",
"minute":"28"
},
"sunrise": {
"hour":"6",
"minute":"55"
},
"sunset": {
"hour":"19",
"minute":"50"
},
"moonrise": {
"hour":"9",
"minute":"50"
},
"moonset": {
"hour":"0",
"minute":"06"
}
},
"sun_phase": {
"sunrise": {
"hour":"6",
"minute":"55"
},
"sunset": {
"hour":"19",
"minute":"50"
}
}
}
i will get the hour & minute from sunset and sunrise to a variable!
my code :
var sunriseHour: [String] = []
var sunriseMinute: [String] = []
var sunsetHour: [String] = []
var sunsetMinute: [String] = []
override func viewDidLoad() {
super.viewDidLoad()
let url=URL(string:"http://api.wunderground.com/api/dbd539bd631e/astronomy/lang:DL/q/DL/iphofen.json")
do {
let allData = try Data(contentsOf: url!)
let data = try JSONSerialization.jsonObject(with: allData, options: JSONSerialization.ReadingOptions.allowFragments) as! [String : AnyObject]
if let arrJSON = data["moon_phase"] {
if let sunriseData = arrJSON["sunrise"]{
print(sunriseData)
}
if let sunsetData = arrJSON["sunset"]{
print(sunsetData)
}
}
print("hour: ",sunriseHour)
print("minute: ",sunriseMinute)
print("hour: ",sunsetHour)
print("minute: ",sunsetMinute)
}
catch {
}
}
i get with print(sunriseData) and print(sunsetData) the right data from this :
Optional({
hour = 6;
minute = 55; }) Optional({
hour = 19;
minute = 50; }) hour: [] minute: [] hour: [] minute: []
How do i get it in the variable sunriseHour, sunriseMinute, sunsetHour, sunsetMinute..
thanks from your help..!

Answer 1

All hour and minute values are (single) String not [String] (array).
Declare all variables as empty strings
var sunriseHour = ""
var sunriseMinute = ""
var sunsetHour = ""
var sunsetMinute = ""
Then do not load data synchronously from a remote URL, use always an asynchronous way:
let url = URL(string:"http://api.wunderground.com/api/dbd539bd631e/astronomy/lang:DL/q/DL/iphofen.json")!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error!)
} else {
do {
guard let jsonData = try JSONSerialization.jsonObject(with:data!) as? [String:Any],
let moonPhase = jsonData["moon_phase"] as? [String:Any] else { return }
let sunrise = moonPhase["sunrise"] as! [String:String]
let sunset = moonPhase["sunset"] as! [String:String]
sunriseHour = sunrise["hour"]!
sunriseMinute = sunrise["minute"]!
sunsetHour = sunset["hour"]!
sunsetMinute = sunset["minute"]!
print("Sunrise - \(sunriseHour):\(sunriseMinute)"
print("Sunset - \(sunsetHour):\(sunsetMinute)"
} catch {
print(error)
}
}
}
task.resume()
The data for sunrise and sunset are in dictionaries derived from moon_phase. All values are forced unwrapped because sunrise and sunset are supposed to exist every day ;-)
PS : Consider to define more descriptive variable names, arrJSON is not very meaningful.