Nested JSON parsing with Swift 4.2

Question

I am using SwiftlyJSON to parse JSON. My JSON looks like this

{
“data”:[{
“id”:123,
“locations”:[{
    “lat”:345,
    “long”:678
},{
    “lat”:345,
    “long”:678
}],
”live”:yes
},{
“id”:123,
“locations”:[{
    “lat”:999,
    “long”:324
},{
    “lat”:865,
    “long”:765
}],
”live”:no
}],
“success”:true,
“status”: 200
}

I want to get every "lat" and "long" from "locations", pair them and show them in a table cell.

My code in Network Service looks like this

private func updateSearchResults(_ data: Data) {
    do {
        let json = try JSON(data: data) //successfully parsed data 
        let locations =  json["data"].arrayValue.map {$0["loactions"].arrayObject}

        print(locations) //locations array is printing out correctly
        for latlang in locations{
          if let lat = latlang["lat"]{
              print(lat) //ERROR here 
          }
        }

    } catch {
        print(error)
    }
}

Error description: Cannot subscript a value of type '[Any]' with an index of type 'String'

Now, I know the error that I can't access locations array by giving string in index but I don't know how to access the "lat" and "long" from JSON. Any help would be greatly appreciated

This line looks like a typo if let lat = latlang["late"]{ shouldn't it be "lat", dropping the e? — Shamas S
– Shamas S, Commented Sep 9, 2019 at 3:47
Yes it was a typo. Corrected the question and added the error description — Abdullah Saeed
– Abdullah Saeed, Commented Sep 9, 2019 at 3:50

Kamran · Accepted Answer · 2019-09-09 04:31:53Z

3

You need to create an array of locations(i.e, Dictionary) using flatMap. Then, access the values as,

if let locations =  json["data"].arrayValue.flatMap { $0["loactions"].arrayObject } as? [[String: Any]] {
   for latlang in locations {
      print(latlang["lat"])
      print(latlang["long"])
   }
}

Suggestion: Stop using SwiftyJSON. Use Codable and generate your model and parsing code using this app.

answered Sep 9, 2019 at 4:31

Kamran

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