UIActivityViewController – is there a way to know which activity was selected?

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You can use Activity Types in setCompletionHandler

UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:nil];

[activityVC setCompletionHandler:^(NSString *activityType, BOOL completed) {
    if([activityType isEqualToString: UIActivityTypeMail]){
        NSLog(@"Mail");
    }
    if([activityType isEqualToString: UIActivityTypePostToFacebook]){
        NSLog(@"Facebook");
    }

}];
[self presentViewController:activityVC animated:TRUE completion:nil];

Built-in activity types for which the system has built-in support for.

NSString *const UIActivityTypePostToFacebook;

NSString *const UIActivityTypePostToTwitter;

NSString *const UIActivityTypePostToWeibo;

NSString *const UIActivityTypeMessage;

NSString *const UIActivityTypeMail;

NSString *const UIActivityTypePrint;

NSString *const UIActivityTypeCopyToPasteboard;

NSString *const UIActivityTypeAssignToContact;

NSString *const UIActivityTypeSaveToCameraRoll;

Edited for iOS 8

Please note that this will generate a compiler warning in iOS 8, you need to use the setCompletionWithItemsHandler method instead of the setCompletionHandler method.

Replace:

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

with: 

[activityVC setCompletionWithItemsHandler:^(NSString *activityType, BOOL completed,  NSArray *returnedItems, NSError *activityError) {

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