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

Posted by Pierre-Emmanuel Turcotte
Pierre-Emmanuel Turcotte
13,670 Points

I cannot seem to nail the method fetchTreehouseBlogPosts declaration.

This is what I have so far.

I get an error to check the method's name and syntax, but the output gives me nothing. Furthermore, in a playground, I get no error.

What am I missing? Any input would be appreciated.

Callbacks.swift 
import Foundation

// Add your code below
typealias BlogPostCompletion = (data: NSData!, response: NSURLResponse!, error: NSError!) -> ()


func fetchTreehouseBlogPosts (completion: BlogPostCompletion) -> Void {
}
Pierre-Emmanuel Turcotte
Pierre-Emmanuel Turcotte
13,670 Points

Bump

Anyone? I've finished the series yet I am not able to complete this exercise...

1 Answer

Chase Marchione
Chase Marchione
155,055 Points
Chase Marchione
Chase Marchione
155,055 Points

Hi Pierre-Emmanuel,

Looks like the issue concerns the void return type, and what statement it should belong to: the typealias. (My hunch is that you were attempting to handle the void with those empty parentheses.)

typealias BlogPostCompletion = ((NSData!, NSURLResponse!, NSError!) -> Void)

// Add your code below
func fetchTreehouseBlogPosts (completion: BlogPostCompletion) {
}

Hope this helps!