gistfile1.txt

    NSMutableArray<id> *items = [NSMutableArray array];
    NSURL *url = [NSURL URLWithString:@"https://www.google.co.jp"];
    NSString *text = @"hello world";
    
    [items addObject:url];
    [items addObject:text];
    UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:items
                                                                                         applicationActivities:nil];
    // select copy action
    [self presentViewController:activityViewController
                                 animated:YES
                               completion:^{
                                   // then check pasteboard
                                   NSArray<NSString*> *strings = [[UIPasteboard generalPasteboard] strings];
                                   NSLog(@"%@", strings); /*
                                                           * (
                                                           * "https://www.google.co.jp\nhello world",
                                                           * "https://www.google.co.jp"
                                                           * )
                                                           *  WTF!?
                                                           */
                               }];