如何在动作表中显示本机共享图标

Question

在iOS 7中，我想分享一些与之类似的行动表：

我的代码是：

NSString *textToShare = @"your text";
UIImage *imageToShare = [UIImage imageNamed:@"yourImage.png"];
NSArray *itemsToShare = @[textToShare, imageToShare];
UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:itemsToShare applicationActivities:nil];
activityVC.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll]; //or whichever you don't need
[self presentViewController:activityVC animated:YES completion:nil];

但我这样空白：