How to add uigesturerecognizer to UIDocumentInteractionController Preview?

Is it possible to add gesture recogniser to UIDocumentInteractionController? Right now I am not able to add anything on UIDocumentInteractionController preview. Please help how to add gesture recogniser or even a button on top of UIDocumentInteraction controller?

See the apple documentation for UIDocumentInteractionController here

They are also providing an example for add gesture recognizers to UIDocumentInteractionController.. See the link here..

来源：https://stackoverflow.com/questions/20604212/how-to-add-uigesturerecognizer-to-uidocumentinteractioncontroller-preview

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ios