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Seth Dobrin
1,459 PointsdownloadTask error in Weather App
I am getting two errors with the code I thought I copied from the leson
let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL, completionHandler: { (location: NSURL!, response: <#NSURLResponse!#>, error: <#NSError!#>) -> Void in println(response) }) downloadTask.resume()
but I get two errors Expected an identifier to name the generic parameter Expected parameter type following
I can figure out what I am doing wrong here
5 Answers
Paul Gustafson
5,041 PointsI also noticed that I must add a
downloadTask.resume()
after your let downloadTask, like so:
let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL!, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in
println(location, response)
})
downloadTask.resume()
Not quite sure why, I am a newbie but it seems like the request doesn't get sent unless that is added.
XCODE VERSION: Version 6.2 (6C131e)
Greg Melson
3,037 PointsI think you may need to change this i.e.
replace
"response:, error:"
with
"response: NSURLResponse!, error: NSError!"
to make it the same as what was shown in the lesson i.e. let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError! ) -> Void in println(response) }) downloadTask.resume()
I don't know if that will fix it but I just noticed that it was missing
I get this error after that "Value of optional type 'NSURL?' not unwrapped; did you mean to use '!' or '?'?"
I'm on Xcode Version 6.1.1 (6A2008a) and Yosemite 10.10.2 But hope the above helps you with your error - I'll keep looking for the answer to mine
Greg Melson
3,037 Pointsok just to add to that for some reason you need to unwrap the "forcastURL" constant i.e. "forcastURL!" then everything works
let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forcastURL!, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError! ) -> Void in println(response) })
..weird I did this a few times but it only now worked. I also closed and reopened Xcode for what it's worth, it's working now - Good luck to you on yours
Greg Melson
3,037 Pointsok just to add to that for some reason you need to unwrap the "forcastURL" constant i.e. "forcastURL!" then everything works
let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forcastURL!, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError! ) -> Void in println(response) })
..weird I did this a few times but it only now worked. I also closed and reopened Xcode for what it's worth, it's working now - Good luck to you on yours
Greg Melson
3,037 Pointsok just to add to that for some reason you need to unwrap the "forcastURL" constant i.e. "forcastURL!" then everything works
let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forcastURL!, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError! ) -> Void in println(response) })
..weird I did this a few times but it only now worked. I also closed and reopened Xcode for what it's worth, it's working now - Good luck to you on yours
Michael Baker
5,709 PointsMichael Baker
5,709 PointsI am having the same problem.