To understand this question, return with me now through the WWDC time machine to the distant past, 2014, when Action extensions were introduced and explained in this video:
https://developer.apple.com/videos/play/wwdc2014/217/
About halfway through, in slide 71, about minute 23:30, the presenter gives instructions for returning a value back to the calling app (the app where the user tapped our Action extension's icon in an activity view):
- (IBAction)done:(id)sender { NSData *data = self.contents; NSItemProvider *itemProvider = [[NSItemProvider alloc] initWithItem:data typeIdentifier:MyDocumentUTI]; NSExtensionItem *item = [[NSExtensionItem alloc] init]; item.attachments = @[itemProvider]; } A moment later, slide 75, about minute 26, we see how the app that put up the activity view controller is supposed to unwrap that envelope to retrieve the result data:
- (void)setupActivityViewController { UIActivityViewController *controller; controller.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *error) { if (completed && (returnedItems.count > 0)) { // process the result items } }]; } So my question is: is that for real? Has anyone within the sound of my voice ever done either of those things? Namely:
Does your app have an Action extension that returns a value to the caller?
Does your app put up an activity view controller that receives the result of some arbitrary unknown Action extension and does something with the value?
I ask because (1) I have never seen (on my iPhone) an Action extension that actually returns a value, and (2) the code elided in "process the result items" seems to me to be complete hand-waving, because how would my app even know what kind of data to expect?
I have come to believe that this code is an aspirational pipe dream with no corresponding reality. But I would be delighted to be told I'm wrong.
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