iOS 8 Share extension loadItemForTypeIdentifier:options:completionHandler: completion closure not executing

Question

I\'m using the loadItemForTypeIdentifier:options:completionHandler: method on an NSItemProvider object to extract a url from Safari via a Share extension in iOS 8.

Answer 1

Since completeRequestReturningItems must be called after all completionHandlers are called back, below is what I do.

 let group = dispatch_group_create()

    for item: AnyObject in self.extensionContext!.inputItems {
        let inputItem = item as! NSExtensionItem
        for provider: AnyObject in inputItem.attachments! {
            let itemProvider = provider as! NSItemProvider
            if itemProvider.hasItemConformingToTypeIdentifier("public.url") {
                dispatch_group_enter(group)
                itemProvider.loadItemForTypeIdentifier("public.url", options: nil, completionHandler: {
                    (result: NSSecureCoding!, error: NSError!) -> Void in
                    //...
                    dispatch_group_leave(group)
                });
            }
            if itemProvider.hasItemConformingToTypeIdentifier(kUTTypeImage as String) {
                dispatch_group_enter(group)
                itemProvider.loadItemForTypeIdentifier(kUTTypeImage as String, options: nil, completionHandler: { (result, error) -> Void in
                    if let resultURL = result as? NSURL {
                        if let image = UIImage(data: NSData(contentsOfURL: resultURL)!) {
                            // ...
                        }
                    }
                    dispatch_group_leave(group)
                });
            }
        }
    }
    dispatch_group_notify(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), {
        self.extensionContext!.completeRequestReturningItems([], completionHandler: nil)
    })