Trouble parsing Divvy bike data with json - ios

Question

Im trying to parse some data from the following link: https://feeds.divvybikes.com/stations/stations.json.
func getData() {
let url = URL(string:"https://feeds.divvybikes.com/stations/stations.json")
// Submit a request
let task = URLSession.shared.dataTask(with: url!) { (data,response,error) in
// print error if there is one
if error != nil {
print(error!)
self.alert(messageTitle: "Error", messageM: "An error occured")
return
} // end if
// if there is no error, fetch the json
if let content = data {
do {
let json = try JSONSerialization.jsonObject(with: content, options:JSONSerialization.ReadingOptions.mutableContainers ) as AnyObject
if let stationName = json["stationBeanList"] as? [String: AnyObject] {
for station in stationName{
if let lat1 = ["latitude"] as? CGFloat, let long1 = ["longitude"] as? CGFloat{
print(lat1,long1)
}
}
}
}
catch {
print(error)
self.alert(messageTitle: "Error", messageM: "An error occured")
}
}//end if
}//end task
task.resume()
//endqueue
}
I would like to grab the longitude and latitude from the link above and plot them on a mapview embedded in swift but I cant seem to get even the longitude and latitude to print out or store properly. Any help would be much appreciated.
i do call the getData function on load()
and nothing shows up in the debugger when I run the application.

Answer 1

In the code you are considering the latitude and longitude as String. But its value is not type String.
So print(lat1,long1) will never be called.
Solution: Consider it as CGFloat instead of String, it will work I think so

Answer 2

let url = URL(string:"https://feeds.divvybikes.com/stations/stations.json")
// Submit a request to get the JASON data
let task = URLSession.shared.dataTask(with: url!) { (data,response,error) in
// if there is an error, print the error and do not continue
if error != nil {
print(error!)
self.alert(messageTitle: "Error", messageM: "An error occured")
return
} // end if
// if there is no error, fetch the json formatted content
if let content = data {
do {
let jsonObject = try JSONSerialization.jsonObject(with: content, options: [] ) as AnyObject
if let JSON = jsonObject["stationBeanList"] as? [[String:AnyObject]] {
for stationInfo in JSON {
if let longitude = stationInfo["longitude"] as? Float64, let latitude = stationInfo["latitude"] as? Float64 {
print(longitude,latitude)
// self.objects.append(stationInfo(latitude:latitude,longitude:longitude))
}//end if
}//end if let
}//end do
}//end do
catch {
print(error)
self.alert(messageTitle: "Error", messageM: "An error occured")
}
}//end if
}//end task
task.resume()
}//endqueue
}

Answer 3

After going through your code what I found is you made a just minor mistake to get lat-long from the call of web service.
if you want to fetch value you need to go according to this after the for loop of stationName.
Here is sample snippet for more clarification.
for station in stationName{
print(station["latitude"] as! Double)
print(station["longitude"] as! Double)
}
Hope this helps you :)

Answer 4

There are many issues.
The main issue is that the value for stationBeanList is an array not a dictionary.
.mutableContainers is completely useless in Swift, omit the parameter.
A Swift 3+ JSON dictionary is [String:Any], an array is [[String:Any]].
The unspecified JSON type in Swift 3+ is Any, never AnyObject.
A standard JSON floating point value is Double.
Never cast a JSON result to Any if the expected type is more specific.
if let json = try JSONSerialization.jsonObject(with: content) as? [String: Any] {
if let stationBeanList = json["stationBeanList"] as? [[String: Any]] {
for stationInfo in stationBeanList {
let lat = stationInfo["latitude"] as! Double
let lng = stationInfo["longitude"] as! Double
print(lat, lng)
}
}
}