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iOS Build a Weather App with Swift (Retired) Pulling Data From the Web Making a Network Call

Richard Price
Richard Price
2,050 Points
Posted by Richard Price
Richard Price
2,050 Points

returning NIL from api call

any ideas API is 100 percent correct

private let apiKey = "bf4be97c0804c2917bf9ae23575a6679"

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: "37.8267,-122.423", relativeToURL: baseURL)

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

    println(weatherData)


}
Dan Merchant
Dan Merchant
Courses Plus Student 22,183 Points
Dan Merchant
Dan Merchant
Courses Plus Student 22,183 Points

I'm having trouble with that too. When I println(forecastURL) it looks backwards, try it yourself to see if the url is correct.

to fix it I just hard coded the URL with a String.

It's early days for Xcode 6 and Swift and the tutorials for swift, so something isn't working correctly.

3 Answers

Chris Stromberg
PLUS
Chris Stromberg
Courses Plus Student 13,389 Points
Chris Stromberg
Chris Stromberg
Courses Plus Student 13,389 Points

I copied your code and it does not work! Getting a compiler error "bound value in a conditional binding must be of optional type"

ben10
ben10
5,289 Points
ben10
ben10
5,289 Points

Here's the problem: 

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

The example actually shows:

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

This has one more backslash for the url. No idea why this would be needed, since the API does show it sans trailing backslash.

Richard Price
Richard Price
2,050 Points
Richard Price
Richard Price
2,050 Points

cheers got it working with this code

private let apiKey = "bf4be97c0804c2917bf9ae23575a6679" private let locationPoints = "37.8267, -122.423"

override func viewDidLoad() {

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

    let baseURL = "https://api.forecast.io/forecast/"
    let encodedPoints = locationPoints.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)! // This method returns an optional, we need to force unwrap

    if let forecastURL = NSURL(string: "\(baseURL)\(apiKey)/\(encodedPoints)") { // We have to optionally bind because this method returns an optional and we need to act on the value it returns.

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

        println(weatherData)

    }

}