NSData dataWithContentsOfURL - Swift

Pasan Premaratne , What is the correct way of using the NSData.dataWithContentsOfURL in the new Xcode version using Swift?

I currently am using Version 6.1 Beta 2 (6A1030) and tried everything without any success.

Did anyone else figure this out?

Hi guys,

I've used Dana's code suggestion and the original suggested in the video but neither of them are working for me. With Dana's code suggestion it is asking for separators to which there is no resolution.

Any suggestions?

Thanks

let weatherData = NSData(contentsOfURL: forecastURL!)

This works since the return value of forecastURL is an optional, we need to implicitly unwrapped it

This is my code and it's returning nil:

    let baseURL = NSURL(string: "https:/api.forecast.io/forecast/\(apiKey)/")
    let forecastURL: NSURL? = NSURL(string: "37.8267,-122.423", relativeToURL: baseURL)
    let weatherData = NSData(contentsOfURL: forecastURL!)

    println(weatherData)

The app crashes when it tries to execute println(weatherData)

Jeroen de Vrind could you please help me with the Build a Simple Weather App project in Swift 2 and Xcode 7? Do you have the source somewhere or could you help me with the Xcode project. I am completely stuck and after I use your do-try syntax from your example above my console says "URLCopyResourcePropertyForKey failed because it was passed an URL which has no scheme Error Domain=NSCocoaErrorDomain Code=256 "The file “37.8267,-122.423” couldn’t be opened." UserInfo={NSURL=37.8267,-122.423}"

I have no idea what I am doing wrong

Use let weatherData = NSData(contentsOfURL: forecastURL!) With the ! after forecastURL

This is what I Have...

import UIKit

class ViewController: UIViewController {

    private let apiKey = "67eb5befcd83c08736eabef9d2adb076"

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.



        let baseURL = NSURL(string: "https://api.forecast.io/forecast/\(apiKey)/")

        let forecastURL = NSURL(string: "40.692837, -73.449052", relativeToURL: baseURL)

        let weatherData = NSData(contentsOfURL: forecastURL!, options: nil, error: nil)

        println(weatherData)

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

(Sorry, trying to use the markdown cheatsheet to get the formatting right).

EDIT: this answer was for Xcode 6.0, not 6.1. the code below is correct in 6.0, however not in 6.1

what error did you get? I was able to call the method just fine using:

let weatherData = NSData.dataWithContentsOfURL(forecastURL, options:nil, error: nil)

which is what he used in the video.

you could also use

let weatherData = NSData(contentsOfURL: forecastURL)

which saves you from having to pass in the nil options and error

Hi all, I too am using Xcode 6.1 Beta 2 and the following NSData functions are broken. The give the same errors mentioned by Dana above:

NSData
    .dataWithContentsOfFile
    .dataWithContentsOfURL
    .dataWithData

The only working function is NSData.dataWithContentsOfMappedFile

I still have Xcode v6.0 installed on my mac and the above functions work as expected so it must be a result of those changes.

Nick

I just posted some code that compiles correctly under the Questions section of this video. Given that Swift has changed quite a bit, the code in the video will not work until it gets updated by the Treehouse team. My code compiles and at least will let you move forward with the course until they get a chance to rework the material. Hope it helps!

Did anyone find the answer to this issue? I am having the same problem THis is what I am entering...

'''swift let weatherData = NSData(contentsOfURL: forecastURL!, options: nil, error: nil) ''' I get: "fatal error: unexpectedly found nil while unwrapping an Optional value (lldb) "

As a response...I have tried most of what you have mentioned.

Your good!!!!

That was it, it is working now.

Thanks Stone! (I appreciate your responsiveness as well!!!)

Had the same issue when using the syntax in the video. I am running XCode 6.1.1. I found the following code takes care of all the errors.

let weatherData = NSData(contentsOfURL: forecastURL!)

That said, I'm still confused on the optional. I have no explicit optional declaration anywhere in my code. In playing with NSURL's various methods, I ran into the need to unwrap its absoluteString method. Has something about NSURL changed that it is now returning an optional?

The following syntax is working for me:

        let weatherData = NSData(contentsOfURL: forecastURL!, options: nil, error: nil)
        println(weatherData)