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Facebook,Twitter图标未显示在iOS7上的UIActivityViewController中

我已添加此代码用于呈现UIActivityViewController:

-(IBAction)activityAction:(id)sender
{
    UIActivityViewController *activityViewController = [[UIActivityViewController alloc]initWithActivityItems:[NSArray arrayWithObjects:@"Hello Welcome!",[UIImage imageNamed:@"scene3.jpg"],nil] applicationActivities:nil];

     activityViewController.excludedActivityTypes = @[UIActivityTypePostToFacebook, UIActivityTypePostToTwitter, UIActivityTypePostToWeibo, UIActivityTypeAssignToContact];
    [self presentViewController:activityViewController animated:YES completion:nil];
}

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iOS7中没有显示Facebook,Twitter和微博图标.在iOS6中,所有图标都正确显示.请参见下面的截图:

在此输入图像描述