UIActivityViewController completion handler still calls action if user presses cancel

Question

In my UIActivityViewController, I use completion handler to execute a "successfully shared" notification. It works but my only problem is, it still shows the notification if the user presses cancel.

Here is my completion handler code,

[controller setCompletionHandler:^(NSString *activityType, BOOL completed) {


    CWStatusBarNotification *notification = [CWStatusBarNotification new];
    [notification displayNotificationWithMessage:@"✓ Successfully Shared Centre!"
                                          forDuration:3.0f];

    notification.notificationLabelBackgroundColor = [UIColor colorWithRed:38.0f/255.0f green:81.0f/255.0f blue:123.0f/255.0f alpha:1.0f];
    notification.notificationLabelTextColor = [UIColor whiteColor];



}];

Thanks for the help!

Answer 1

That's what the completed argument is for:

[controller setCompletionHandler:^(NSString *activityType, BOOL completed) {
    if (!completed) return;

    CWStatusBarNotification *notification = [CWStatusBarNotification new];
    [notification displayNotificationWithMessage:@"✓ Successfully Shared Centre!"
                                     forDuration:3.0f];

    notification.notificationLabelBackgroundColor = [UIColor colorWithRed:38.0f/255.0f green:81.0f/255.0f blue:123.0f/255.0f alpha:1.0f];
    notification.notificationLabelTextColor = [UIColor whiteColor];
}];

Answer 2

Note: the completionHandler property is deprecated in iOS8, so it's not possible anymore to know the result of a share action. https://developer.apple.com/documentation/uikit/uiactivityviewcontroller/1622010-completionhandler

Update: Like adruzh said, on iOS8 there's a new completionHandler that Apple forgot to mention in the documentation:

[activityController setCompletionWithItemsHandler:
    ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
}];

https://developer.apple.com/documentation/uikit/uiactivityviewcontroller/1622022-completionwithitemshandler

Answer 3

For Swift, this is what worked for us:

    ...

    // Configure UIActivityViewController
    let activityViewController = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
    activityViewController.excludedActivityTypes = [UIActivityTypeAirDrop,
        UIActivityTypeAddToReadingList,
        UIActivityTypeAssignToContact,
        UIActivityTypePrint,
        UIActivityTypeCopyToPasteboard]

    // Show UIActivityViewController
    presentViewController(activityViewController, animated: true, completion: nil)

    // Define completion handler
    activityViewController.completionWithItemsHandler = doneSharingHandler

    ...

func doneSharingHandler(activityType: String!, completed: Bool, returnedItems: [AnyObject]!, error: NSError!) {
    // Return if cancelled
    if (!completed) {
        return
    }

    // If here, log which activity occurred
    println("Shared video activity: \(activityType)")
}

Answer 4

For the Swifties out there, here's how you would code this in Swift along with some share service detection:

activityViewController.completionHandler = {(activityType, completed:Bool) in
    if !completed {
        //cancelled
        return
    }

    //shared successfully

    //below is how you would detect for different sharing services
    var activity:String = "other"
    if activityType == UIActivityTypePostToTwitter {
        activity = "twitter"
    }
    if activityType == UIActivityTypeMail {
        activity = "mail"
    }
    //more code here if you like
}

Answer 5

The completed parameter will be NO is the user cancels.

[controller setCompletionHandler:^(NSString *activityType, BOOL completed) {
    if (completed) {
        CWStatusBarNotification *notification = [CWStatusBarNotification new];
        [notification displayNotificationWithMessage:@"✓ Successfully Shared Centre!"
                                          forDuration:3.0f];

        notification.notificationLabelBackgroundColor = [UIColor colorWithRed:38.0f/255.0f green:81.0f/255.0f blue:123.0f/255.0f alpha:1.0f];
        notification.notificationLabelTextColor = [UIColor whiteColor];
    }
}];

Answer 6

SWIFT 2.0, iOS 8.0 >, you should use completion handler like this:

self.presentViewController(activityVC, animated: true, completion: nil)

activityVC.completionWithItemsHandler = {(activityType, completed:Bool, returnedItems:[AnyObject]?, error: NSError?) in
     //do some action
}

see my answer here: https://stackoverflow.com/a/34581940/1109892

Answer 7

Swift 3

   func completionHandler(activityType: UIActivityType?, shared: Bool, items: [Any]?, error: Error?) {
        if (shared) {
            print("Cool user shared some stuff")
        }
        else {
            print("Bad user canceled sharing :(")
        }
    }

    activityController.completionWithItemsHandler = completionHandler