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iOS Build a Weather App with Swift Managing Complexity Callback Methods With Closures

Julien Frisch
Julien Frisch
4,464 Points
Posted by Julien Frisch
Julien Frisch
4,464 Points

Despite having no compiler error, I do not manage to configure the completion handler. Can someone help?

I have been trying multiple combinations and re-use several existing piece of code, but for some reason I keep getting the same error Message: "Make sure you pass the correct order and type of parameters to the completion handler of the fetchTreehouseBlogPosts method."

Callbacks.swift 
import Foundation

// Add your code below
typealias BlogPostCompletion = ((NSData!, NSURLResponse!, NSError!) -> Void)
func fetchTreehouseBlogPosts(handler: BlogPostCompletion){

    let blogURL = NSURL(string: "http://blog.teamtreehouse.com/api/")
    let requestURL = NSURL(string: "get_recent_summary/?count=20", relativeToURL: blogURL)
    let request = NSURLRequest(URL: requestURL!)
    let config = NSURLSessionConfiguration.defaultSessionConfiguration()
    let session = NSURLSession(configuration: config)

    //Add your code between the comments
    let dataTask = session.dataTaskWithRequest(request){
       (let data, let response, let error) in
         handler(data, response, error)
    }
    //Add code above

    dataTask.resume()

}