Ios UIActivityViewController完成处理程序显示'；已完成'；即使用户不是'；无法登录Tumblr或其他应用程序

我使用completionWithItemsHandler来确定selectedItems是否已发布到Tumblr。我想展示一个“成功！”如果post已完成，但即使用户无法登录Tumblr，completionHandler也会返回“completed”（已完成），则发出警报。也就是说，用户完成了选择项目、打开活动视图和选择Tumblr-->的步骤。这将打开Tumblr应用程序并要求登录。如果用户按“取消”并返回到我的应用程序，completionHandler会说活动已“完成”。有没有办法确定post是否成功？有没有办法测试用户是否能够登录到应用程序？当可能存在这些类型的问题时，有没有处理“成功”警报的建议？
这是完成处理程序

activityController.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *error){

    if (error)
    {
        //NSError *error;

        alertController = [UIAlertController alertControllerWithTitle:@"Error" message:@"Error sharing items" preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction *errorAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"OK", @"OK action") style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
            NSLog(@"Error sharing items: %@", error);
        }];

        [alertController addAction:errorAction];

        [self presentViewController:alertController animated:YES completion:nil];
    }
    else if (completed)
    {
        [self.activityIndicator stopAnimating];

        if ([self.giftID isEqualToString:@"general"]||[self.giftEntity.giftThanked isEqualToString:@"YES"])
        {
            alertController = [UIAlertController alertControllerWithTitle:alertTitle message:nil preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *okAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"OK", @"OK action") style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
           // NSLog(@"OK action");
            [self dismissViewControllerAnimated:YES completion:nil];
        }];

        [alertController addAction:okAction];

        [self presentViewController:alertController animated:YES completion:nil];
        }

        if (![self.giftID isEqualToString:@"general"]&&[self.giftEntity.giftThanked isEqualToString:@"NO"])
        {
            alertController = [UIAlertController alertControllerWithTitle:alertTitle message:@"Mark gift as 'Thanked'?" preferredStyle:UIAlertControllerStyleAlert];

            UIAlertAction *yesAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"YES", @"yes action") style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
                self.giftEntity.giftThanked = @"YES";
                [self.giftBusObj saveEntities];

                [self dismissViewControllerAnimated:YES completion:nil];
            }];

            UIAlertAction *noAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"NO", @"no action") style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
                self.giftEntity.giftThanked = @"NO";
                [self.giftBusObj saveEntities];

                [self dismissViewControllerAnimated:YES completion:nil];
            }];

            [alertController addAction:noAction];
            [alertController addAction:yesAction];

            [self presentViewController:alertController animated:YES completion:nil];
        }

        //Deselect all items in stvc

        self.textShare = 0;
        self.cardButton.selected = NO;

        self.textImageBackground.backgroundColor = [UIColor clearColor];
        self.cardImageBackground.backgroundColor = [UIColor clearColor];

        [spcvc selectPhotosNone];

        [self viewDidLoad];
    }

    else
    {
        [self dismissViewControllerAnimated:YES completion:nil];
        NSLog(@"activity controller - not 'completed' nor 'error'" );
    }
};

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你能发布完成处理程序的代码吗？我刚刚添加了它-谢谢