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iOS

Posted by Dustin Shelley
Dustin Shelley
Courses Plus Student 4,608 Points

I'm not getting JSON data.

I'm not getting any JSON data. Its running and making API calls just not returning any data. Any suggestions?

import UIKit

class ViewController: UIViewController {

    private let apiKey = "010101010110"

    override func viewDidLoad() {
        super.viewDidLoad()


        let baseURL = NSURL(string:"https://api.forecast.io/forecast/\(apiKey)/")
        let forecastURL = NSURL ( string: "33.3777503,-84.763111,13", relativeToURL: baseURL)

        let sharedSession = NSURLSession.sharedSession()
        let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL!, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in

           var urlContents = NSString(contentsOfURL: NSURL(), encoding: UInt(), error: NSErrorPointer())
            println(urlContents)
        })

        downloadTask.resume()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }


}

3 Answers

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

you have too many coordinates in your URL. you should only have 2.

// you provided 3 coords instead of 2. remove the ,13:
let forecastURL = NSURL ( string: "33.3777503,-84.763111,13", relativeToURL: baseURL)

remove that last one

let forecastURL = NSURL ( string: "33.3777503,-84.763111", relativeToURL: baseURL)

or remove the comma if its supposed to be part of the last coord

let forecastURL = NSURL ( string: "33.3777503,-84.76311113", relativeToURL: baseURL)
Dustin Shelley
PLUS
Dustin Shelley
Courses Plus Student 4,608 Points
Dustin Shelley
Dustin Shelley
Courses Plus Student 4,608 Points

Thanks for catching that. Closed and opened Xcode again, fixed coordinates. Now I'm getting "fatal error: unexpectedly found nil while unwrapping an Optional value" in this line.

let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL!, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in
Stone Preston
Stone Preston
42,016 Points

post your new code after modifying the URL

Dustin Shelley
Dustin Shelley
Courses Plus Student 4,608 Points 
import UIKit

class ViewController: UIViewController {

    private let apiKey = "0101010"

    override func viewDidLoad() {
        super.viewDidLoad()

        let baseURL = NSURL(string:"https://api.forecast.io/forecast/\(apiKey)/")
        let forecastURL = NSURL ( string: "33.378109, -84.799675", relativeToURL: baseURL)

        let sharedSession = NSURLSession.sharedSession()
        let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL!, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in

           var urlContents = NSString(contentsOfURL: NSURL(), encoding: UInt(), error: NSErrorPointer())
            println(urlContents)
        })

        downloadTask.resume()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }


}
Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

remove the space between the coords. URLs cant have spaces:

let forecastURL = NSURL ( string: "33.378109,-84.799675", relativeToURL: baseURL)
Dustin Shelley
Dustin Shelley
Courses Plus Student 4,608 Points

Fixed that. Sorry copying and pasting coordinates is giving me problems. Still no Json data anywhere. Debug output shows nil. Simulator is white.

Stone Preston
Stone Preston
42,016 Points

its probably nil because of this:

 var urlContents = NSString(contentsOfURL: NSURL(), encoding: UInt(), error: NSErrorPointer())

the URL you are passing in is NSURL() which is just an empty URL. try passing in the location URL instead:

 var urlContents = NSString(contentsOfURL: location, encoding: UInt(), error: NSErrorPointer())