问UIActivityViewController没有在iPad上工作？iOS 8

EN

- (IBAction)shareButton:(id)sender;
{
    NSString * text = [NSString stringWithFormat:@"I just scored %li in Flying Freddy. Think you can beat it? https://itunes.apple.com/app/id1033007818", (long)_score];

NSArray *objectsToShare = @[text];

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

NSArray *excludeActivities = @[UIActivityTypeAirDrop,
                               UIActivityTypePrint,
                               UIActivityTypeAssignToContact,
                               UIActivityTypeSaveToCameraRoll,
                               UIActivityTypeAddToReadingList,
                               UIActivityTypePostToFlickr,
                               UIActivityTypePostToVimeo];

activityVC.excludedActivityTypes = excludeActivities;

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

- (IBAction)ShareIt {

    NSString * text = [NSString stringWithFormat:@"I just scored %li in Flying Freddy. Think you can beat it? https://itunes.apple.com/app/id1033007818", (long)_score];

    NSArray * activityItems = @[text];
    UIActivityViewController * avc = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:nil];
    avc.excludedActivityTypes = @[ UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll];

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