# documentInteractionController(_:performAction:) Called when a document interaction controller wants its delegate to perform a specified action with the associated document. ``` optional func documentInteractionController(_ controller: UIDocumentInteractionController, performAction action: Selector?) -> Bool ``` ## Parameters `controller` The document interaction controller managing an associated document. `action` The selector representing the action to perform. You can invoke this selector directly on the object responsible for performing the action or use it to call the appropriate method. ## Return Value if the action was performed successfully or if it was not. ## Discussion The supported `action` selectors for this method are `copy:` and `print:`. (The `print:` selector is available in iOS 4.2 and later. Printing is supported only on devices that support multitasking.) To implement a `copy:` action, write the contents of the document—directly, or modified according to the intent of your app—to the pasteboard. To implement a `print:` action, use the shared print interaction controller object. Assign the [`url`](/documentation/UIKit/UIDocumentInteractionController/url) property of the document interaction controller to the print interaction controller’s [`printingItem`](/documentation/UIKit/UIPrintInteractionController/printingItem) property. Then present the printing user interface. For details, refer to [`UIPrintInteractionController`](/documentation/UIKit/UIPrintInteractionController) and to [Printing](https://developer.apple.com/library/archive/documentation/2DDrawing/Conceptual/DrawingPrintingiOS/Printing/Printing.html#//apple_ref/doc/uid/TP40010156-CH12) in [Drawing and Printing Guide for iOS](https://developer.apple.com/library/archive/documentation/2DDrawing/Conceptual/DrawingPrintingiOS/Introduction/Introduction.html#//apple_ref/doc/uid/TP40010156). Instead of implementing printing code in this method, you can rely on the built-in printing support of the Quick Look framework. For document types that can be previewed, the options menu of a document interaction controller always contains a Quick Look item. If the user chooses that item, the resulting Quick Look view includes an action button in the navigation bar that, when tapped, offers a Print button. In this case, the system automatically handles printing. For details, refer to and to [Using the Quick Look Framework](https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/DocumentInteraction_TopicsForIOS/Articles/UsingtheQuickLookFramework.html#//apple_ref/doc/uid/TP40010413) in [Document Interaction Programming Topics for iOS](https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/DocumentInteraction_TopicsForIOS/Introduction/Introduction.html#//apple_ref/doc/uid/TP40010403). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)