iphone – Twitter发布iOS6“取消”按钮问题

- (IBACtion)twitterPost:(id)sender
{
if([SLComposeViewController isAvailableForserviCEType:SLserviCETypeTwitter])
{
    mySLComposerSheet = [[SLComposeViewController alloc] init];
    mySLComposerSheet = [SLComposeViewController   composeViewControllerForserviCEType:SLserviCETypeTwitter];
    [mySLComposerSheet seTinitialText:[NSString StringWithFormat:@"This is my tweet,Hello!",mySLComposerSheet.serviCEType]];
    [self presentViewController:mySLComposerSheet animated:YES completion:nil];
}
[mySLComposerSheet setCompletionHandler:^(SLComposeViewControllerResult result) {
    NSLog(@"dfsdf");
    switch (result) {
        case SLComposeViewControllerResultCancelled:
            break;
        case SLComposeViewControllerResultDone:
            break;
        default:
            break;
    }
}];


}