CODEWITHSUNDEEP
swift3nsurlrequesturlrequest
Michael Moulsdale
Michael Moulsdale

Reputation: 1488

swift 3 urlRequest session.dataTask not firing

I am trying to get stock quotes from Yahoo using Swift 3. Although there are some decent tutorials on Swift 2, none of them seem to translate well to Swift 3.

The issue I have at the moment is that in the code below, the session.dataTask is never called. The print statement never fires and the rest of the code that is in there does not work.

I have checked that the request variable looks good, and the url has been tested on the yahoo developer site.

So I'm thinking I must have the syntax of the dataTask wrong or has an error so is skipping completely.

Any thoughts?

    urlString = "http://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.quotes where symbol IN ('APL')"

        //let urlNSS : NSString = urlString as NSString
        let urlStr : String = urlString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
        let url : URL = URL(string: urlStr as String)!
        let request = URLRequest(url: url)
        let session = URLSession.shared
        let config = URLSessionConfiguration.default

        let task = session.dataTask(with: request, completionHandler: {(data, response, error) -> Void in

            print("in the task")

            ..
            ..
        )}

task.resume()

If I inspect task I see the following enter image description here

Upvotes: 3

Views: 3493

Answers (1)

Pranav Jaiswal
Pranav Jaiswal

Reputation: 3752

You must resume the task (task.resume()) that you have created. By default, a task is in suspended state.

I have created a Playground file with a different Yahoo RSS Feed URL. https://drive.google.com/file/d/0B5nqEBSJjCriWl9UTWcxSE42Yk0/view?usp=sharing

The URL you have in your question is not giving any data.

    <error xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" yahoo:lang="en-US">
<description>No definition found for Table yahoo.finance.quotes</description>
</error>

Code as Below:

    //: Playground - noun: a place where people can play

import UIKit
import Foundation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
var str = "Hello, playground"

let yahooURLString = "https://feeds.finance.yahoo.com/rss/2.0/headline?s=yhoo&region=US&lang=en-US"
let yahooRSSURL: URL = URL(string: yahooURLString)!

var request = URLRequest(url: yahooRSSURL)
request.httpMethod = "GET"

let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let task = session.dataTask(with: request) {data, response, err in
    print("Entered the completionHandler")
    print("Response JSON:\n\(String(data: data!, encoding: String.Encoding.utf8)!)")
}
task.resume()

Hope this helps.

Edit: Attaching a screenshot of print statements appearing in the console of playgorund. enter image description here

Upvotes: 4

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