How to return error from share extension

Question

if i close my extension with

[self.extensionContext cancelRequestWithError:error];

the error is not returned to the app via UIActivityViewController completion blocks activityError

[vc setCompletionWithItemsHandler:^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
    // activityError is nil, even when cancelRequestWithError: called  with error
}

Answer 1

Create a userDefaults Suite with app groups and set a boolean value indicating error if it happened in the Extension / save it's string description and read it in the app , also don't forget to make it false / nil after process . . .