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iOS Build a Weather App with Swift Interacting with Data From the Web Fetching Data

Mateo Sossah
Mateo Sossah
6,598 Points
Posted by Mateo Sossah
Mateo Sossah
6,598 Points

Error with contentsofURL

When I try to create the weatherData constent, I do not find the NSData(contentsOfURL: , options: , error: ) structure and get the following error when I use it: "Arguments lables do not match any available overloads". Any idea why? Thanks a lot

Here is my code:

override func viewDidLoad() { super.viewDidLoad()

    let baseURL = NSURL(string: "https://api.forecast.io/forecast/\(forecastAPIKey)/")
    let forecastURL = NSURL(string: "37.8262, -122.423", relativeToURL: baseURL)
    let weatherData = NSData(contentsOfURL: forecastURL!, options: nil, error: nil)
Shandas Duchintav
Shandas Duchintav
8,222 Points
Shandas Duchintav
Shandas Duchintav
8,222 Points

Hi! I got the same error as you and I think it's just that XCode version in the video is older and we are using the updated version. However, I could be wrong.

This is how I fixed the error.

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

The error won't go away, however my code was executed and I had 1 less call count on DarkSky.

Cheers

3 Answers

Inkwon Kim
PLUS
Inkwon Kim
Courses Plus Student 11,889 Points
Inkwon Kim
Inkwon Kim
Courses Plus Student 11,889 Points

Change : let weatherData = try? NSData(contentsOfURL: forecastURL!, options: [])

Atif Naqvi
Atif Naqvi
4,144 Points
Atif Naqvi
Atif Naqvi
4,144 Points

Thanks. This took care of the warning, currently using xcode 7 and swift 2.0. I hope it works for the rest of the tutorial.

print(weatherData) did not work with this fix.

I do not understand whats going on with try?, and the options: [], chalking it up to swift 2 changes

Eric Aichele
Eric Aichele
4,710 Points
Eric Aichele
Eric Aichele
4,710 Points

It's been a while since Swift 2.0 has released. Can we get an update to any of this? A Google Doc or SOMETHING?

Tony Brackins
Tony Brackins
28,766 Points
Tony Brackins
Tony Brackins
28,766 Points

Here's what worked for me:

// Data Object to fetch weather data

    let weatherData: NSData

    do {
    weatherData = try! NSData(contentsOfURL: forecastURL!, options: [])
    } catch  {
       print("error")
    }

    print(weatherData)