CODEWITHSUNDEEP
jsonswift
seanhungerford
seanhungerford

Reputation: 107

How do I make JSON data appear on a Label instead of in the console? (Swift)

I am trying to make an iPhone application that displays stock market data. I specifically want it to display the number one gainer for the day percentage wise. I have two problems: 1. Right now I only know how to display the json into the console instead of on the iphone screen via a label or something. 2. The data I get have multiple data points, when I just want the number one highest gainer.

I will now provide my code as well as the Json output I get and want on a Label:

Code:

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        var str = "Hello, playground"

        let url = URL(string: "https://financialmodelingprep.com/api/v3/stock/gainers?apikey=<api-key>")

        var request = URLRequest(url: url!)

        request.addValue("application/json", forHTTPHeaderField: "Accept")
        let task = URLSession.shared.dataTask(with: url!) { data, response, error in
            guard error == nil else {
                print(error!)
                return
            }
            guard let data = data else {
                print("Data is empty")
                return
            }

            let json = try! JSONSerialization.jsonObject(with: data, options: [])
            print(json)
        }

        task.resume()

Json data I get, but only want the one single top percentage gainer result:

{
    mostGainerStock =     (
                {
            changes = "3.0892";
            changesPercentage = "(+43.57%)";
            companyName = "Cassava Sciences Inc";
            price = "10.1792";
            ticker = SAVA;
        },
                {
            changes = "0.55";
            changesPercentage = "(+33.95%)";
            companyName = "Westport Fuel Systems Inc";
            price = "2.17";
            ticker = WPRT;
        },
                {
            changes = "0.08409999999999999";
            changesPercentage = "(+25.88%)";
            companyName = "SandRidge Permian Trust";
            price = "0.409";
            ticker = PER;
        },
                {
            changes = "0.53";
            changesPercentage = "(+25.73%)";
            companyName = "ReneSola Ltd";
            price = "2.59";
            ticker = SOL;
        },
                {
            changes = "0.59";
            changesPercentage = "(+25.00%)";
            companyName = "Art's Way Manufacturing Co Inc";
            price = "2.95";
            ticker = ARTW;
        },
                {
            changes = "0.06";
            changesPercentage = "(+24.00%)";
            companyName = "Onconova Therapeutics Inc";
            price = "0.31";
            ticker = ONTX;
        },
                {
            changes = "1.33";
            changesPercentage = "(+22.17%)";
            companyName = "Contura Energy Inc";
            price = "7.33";
            ticker = CTRA;
        },
                {
            changes = "0.48";
            changesPercentage = "(+21.15%)";
            companyName = "Renren Inc";
            price = "2.75";
            ticker = RENN;
        },
                {
            changes = "0.2";
            changesPercentage = "(+19.23%)";
            companyName = "StoneMor Partners LP";
            price = "1.24";
            ticker = STON;
        },
                {
            changes = "13.0999";
            changesPercentage = "(+18.41%)";
            companyName = "IGM Biosciences Inc";
            price = "84.2399";
            ticker = IGMS;
        },
                {
            changes = "2.58";
            changesPercentage = "(+17.73%)";
            companyName = "Bloom Energy Corp";
            price = "17.13";
            ticker = BE;
        },
                {
            changes = "0.99";
            changesPercentage = "(+17.07%)";
            companyName = "Flux Power Holdings Inc";
            price = "6.79";
            ticker = FLUX;
        },
                {
            changes = "0.185";
            changesPercentage = "(+16.97%)";
            companyName = "Remark Holdings Inc";
            price = "1.275";
            ticker = MARK;
        },
                {
            changes = "0.8100000000000001";
            changesPercentage = "(+16.95%)";
            companyName = "J Alexanders Holdings Inc";
            price = "5.59";
            ticker = JAX;
        },
                {
            changes = "0.33";
            changesPercentage = "(+16.92%)";
            companyName = "Rexahn Pharmaceuticals Inc";
            price = "2.28";
            ticker = REXN;
        },
                {
            changes = "0.23";
            changesPercentage = "(+16.79%)";
            companyName = "AcelRx Pharmaceuticals Inc";
            price = "1.6";
            ticker = ACRX;
        },
                {
            changes = "0.79";
            changesPercentage = "(+16.49%)";
            companyName = "Orgenesis Inc";
            price = "5.58";
            ticker = ORGS;
        },
                {
            changes = "0.405";
            changesPercentage = "(+15.46%)";
            companyName = "Evogene Ltd";
            price = "3.025";
            ticker = EVGN;
        },
                {
            changes = "0.0426";
            changesPercentage = "(+15.10%)";
            companyName = "Pacific Drilling SA";
            price = "0.3247";
            ticker = PACD;
        },
                {
            changes = "1.075";
            changesPercentage = "(+15.05%)";
            companyName = "Fluidigm Corp";
            price = "8.22";
            ticker = FLDM;
        },
                {
            changes = "1.99";
            changesPercentage = "(+14.85%)";
            companyName = "Ituran Location and Control Ltd";
            price = "15.39";
            ticker = ITRN;
        },
                {
            changes = "0.32";
            changesPercentage = "(+14.41%)";
            companyName = "Trevena Inc";
            price = "2.54";
            ticker = TRVN;
        },
                {
            changes = "0.61";
            changesPercentage = "(+14.22%)";
            companyName = "Golden Bull Ltd";
            price = "4.9";
            ticker = DNJR;
        },
                {
            changes = "2.005";
            changesPercentage = "(+14.20%)";
            companyName = "Dave & Buster's Entertainment Inc";
            price = "16.125";
            ticker = PLAY;
        },
                {
            changes = "0.455";
            changesPercentage = "(+14.15%)";
            companyName = "Marinus Pharmaceuticals Inc";
            price = "3.67";
            ticker = MRNS;
        },
                {
            changes = "1.49";
            changesPercentage = "(+14.08%)";
            companyName = "Pivotal Investment Corporation II";
            price = "12.075";
            ticker = PIC;
        },
                {
            changes = "1.4881";
            changesPercentage = "(+13.91%)";
            companyName = "Eastman Kodak Co";
            price = "12.1881";
            ticker = KODK;
        },
                {
            changes = "0.6";
            changesPercentage = "(+13.70%)";
            companyName = "NextDecade Corp";
            price = "4.98";
            ticker = NEXT;
        },
                {
            changes = "0.92";
            changesPercentage = "(+13.09%)";
            companyName = "Trans World Entertainment Corp";
            price = "7.95";
            ticker = TWMC;
        },
                {
            changes = "1.07";
            changesPercentage = "(+12.85%)";
            companyName = "Veritone Inc";
            price = "9.4";
            ticker = VERI;
        }
    );
}

Thanks so much for your time

Upvotes: 0

Views: 64

Answers (1)

Razib Mollick
Razib Mollick

Reputation: 5052

There are tons of examples in SO to resolve this issue. Just in this case, I would like to use codable model to extract data.

Add this struct models to app:

struct StockModel: Codable {
    let mostGainerStock: [MostGainerStock]
}

struct MostGainerStock: Codable {
    let ticker: String
    let changes: Double
    let price, changesPercentage, companyName: String
}

After that change your code like below.

//  let json = try! JSONSerialization.jsonObject(with: data, options: [])
//Add this New
if let model = try? JSONDecoder().decode(StockModel.self, from: data) {
       DispatchQueue.main.async {
                //Example of first data update to Label
                self.tickerLbl.text = model.mostGainerStock[0].ticker
                self.gainLbl.text = model.mostGainerStock[0].changesPercentage
       }
 }

Upvotes: 2

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