Rapid increase in the share of the killed

Question

I have an extension for iOS written in Swift.

This is my first option with Swift, and I am having problems closing the sharing extension before the actions are completed. This Share extension adds an audio file to the API. Before sending to the server, the audio file must be base64. It seems to work for audio files that are less than 30 seconds or so, but as soon as they are larger, it seems that the sharing extension closes the code and never starts.

Below is the code:

override func didSelectPost() { let defaults = NSUserDefaults(suiteName: suiteName) var authorization: String? = defaults!.stringForKey("Authorization") authorization = authorization!.stringByReplacingOccurrencesOfString("\"", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil) if let content = extensionContext!.inputItems[0] as? NSExtensionItem { let contentType = kUTTypeAudio as String if let contents = content.attachments as? [NSItemProvider] { for attachment in contents { attachment.loadItemForTypeIdentifier(contentType, options: nil) { data, error in let url = data as! NSURL do { let audioData = try NSData(contentsOfURL: url, options: NSDataReadingOptions()) let base64Audio = audioData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0)) print(base64Audio) let sessionConfig = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(self.suiteNameSessionConfig) // Extensions aren't allowed their own cache disk space. Need to share with application sessionConfig.sharedContainerIdentifier = self.suiteName let session = NSURLSession(configuration: sessionConfig) let url = NSURL(string: "https://api.example.com/upload") let request = NSMutableURLRequest(URL: url!) request.setValue("application/json", forHTTPHeaderField: "Content-Type") request.setValue("application/json", forHTTPHeaderField: "Accept") request.setValue(authorization!, forHTTPHeaderField: "Authorization") request.HTTPMethod = "POST" let jsonObject:[String: AnyObject] = [ "recording": [ "file": "data:audio/x-m4a;base64," + base64Audio] ] var jsonError: NSError? do { let jsonData = try NSJSONSerialization.dataWithJSONObject(jsonObject, options:[]) request.HTTPBody = jsonData } catch { request.HTTPBody = nil } let task = session.dataTaskWithRequest(request) task.resume() self.extensionContext!.completeRequestReturningItems([], completionHandler: nil) } catch { print(error) self.extensionContext!.completeRequestReturningItems([], completionHandler: nil) } } } } else { self.extensionContext!.completeRequestReturningItems([], completionHandler: nil) } } else { self.extensionContext!.completeRequestReturningItems([], completionHandler: nil) } }