DookieMan DookieMan - 5 months ago 36
iOS Question

How to use NSURLSessionDataTask in Swift

Can someone help me? I can't find a good example for the completion syntax.

var url : NSURL = NSURL.URLWithString("https://itunes.apple.com/search?term=\(searchTerm)&media=software")
var request: NSURLRequest = NSURLRequest(URL:url)
let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession.sessionWithConfiguration(config)

NSURLSessionDataTask(session.dataTaskWithRequest(request, completionHandler: ((NSData!, NSURLResponse!, NSError!) -> Void)?)


Thanks!

Answer

It's unclear what you're asking, but I noticed that you have a couple of errors in the code:

  1. You should create your session using NSURLSession(configuration: config)

  2. session.dataTaskWithRequest returns a NSURLSessionDataTask, so there's no need to wrap it inside NSURLSessionDataTask() (a.k.a instantiating a new NSURLSessionDataTask object).

  3. The completion handler is a closure and here's how you create that particular clousure:

    {(data : NSData!, response : NSURLResponse!, error : NSError!) in
    
        // your code
    
    }
    

Here's the updated code:

let url = NSURL(string: "https://itunes.apple.com/search?term=\(searchTerm)&media=software")
let request = NSURLRequest(URL: url)
let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: config)

let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in

    // notice that I can omit the types of data, response and error

    // your code

});

// do whatever you need with the task e.g. run
task.resume()