Question 72154 in IOS Swift Question posted in
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Parsing JSON for Swift: SeatGeek API – Ios swift

I’m trying to parse JSON from the seat geek API but I keep getting a JSON error. I have tried rearranging the structs but to no avail.

This is what I have now but it is not working. Please help.

import Foundation

class Concerts {

struct Returned: Codable {
    let events: [EventsData]
}

struct EventsData: Codable {
    var url: String
    var type: String
    var venue: Location
    var performers: [Performer]
}

struct Performer: Codable {
    var name: String
}

struct Location: Codable {
    var display_location: String!
    var name: String
}



var url = "https://api.seatgeek.com/2/events?venue.state=NY?client_id=(APIkeys.seatGeekKey)"

var concertArray: [ConcertData] = []
var count = 0

func getData(completed: @escaping () -> ()) {
    let urlString = url
    guard let url = URL(string: urlString) else {
        completed()
        return
    }
    let session = URLSession.shared
    let task = session.dataTask(with: url) { data, response, error in
        if error != nil {
            print("ERROR")
        }
        do {
            let returned = try JSONDecoder().decode(Returned.self, from: data!)
            
            for data in returned.events {
                self.concertArray.append(ConcertData(venue: data.venue.name, name: data.performers.first?.name ?? "", location: data.venue.display_location, type: data.type, url: data.url ?? ""))
            }
        } catch {
            print("JSON Error")
        }
        completed()
    }
    task.resume()
}

}

Tags:

2

Answers


  1. 0

    Try the Alamofire and SwiftyJSON. The method for fetching data with json reader got deprecated.

    struct DataItem: Decodable{
    let param1: String?
    let param2: String?
    let param3: SubDataItem?
    
    enum CodingKeys: String, CodingKey{
        case param1 = "param1_key"
        case param2 = "param2_key"
        case param3 = "param3_key"
    }
}

struct SubDataItem: Decodable{
    let abc: String?
    
    enum CodingKeys: String, CodingKey{
        case abc = "abc"
    }
}

struct DataList: Decodable{
    let results: [DataItem]?
    
    enum CodingKeys: String, CodingKey{
        case results = "results"
    }
}

    Data classes above are for the json structure something like this.

    { 
    "results" : [
        {
            "param1_key": "val1",
            "param2_key": "val2",
            "param3_key": {
                "abc": "sub_val"
            }
        },
        {
            "param1_key": "val1",
            "param2_key": "val2",
            "param3_key": {
                "abc": "sub_val"
            }
        }
    ]
}

    This is the function where you are calling api by using Alamofire and Dataclasses above.

    func loadData(parameter){
    let url = "url"

    let parameters: [String: Any] = [
        "xyz": value
    ]

    AF.request(url, parameters: parameters)
        .validate()
        .responseDecodable(of: DataList.self) { response in
            guard let dataList = response.value else {
                 print("failed")
                 return 
            }

            print(dataList.results?.count ?? 0)
    }
}
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  2. 0

    Identified the problem from the comment of @workingdogsupportUkraine

    Your API endpoint is not in the correct format, you need to replace ? with & before client_id of your URL.

    var url = "https://api.seatgeek.com/2/events?venue.state=NY&client_id=(APIkeys.seatGeekKey)"
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