Opening a file by UIDocumentInteractionController

Question

I am using UIDocumentInteractionController for opening documents in my app. I have used method below for previewing the PDF file:-

- (IBAction)previewDocument:(id)sender 
{
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"sample" ofType:@"pdf"];

    // Initialize Document Interaction Controller
    self.documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:filePath]];

    // Configure Document Interaction Controller
    [self.documentInteractionController setDelegate:self];

    // Preview PDF
    [self.documentInteractionController presentOptionsMenuFromRect:down.frame inView:self.view animated:YES];

}

I have read that we can read files in an app from other app too by UIDocumentInteractionController.

In my app, How can I read the files from other app using UIDocumentInteractionController? How does all this happens?

Answer 1

Previewing the PDF document and sharing.

Set Delegate Method:- UIDocumentInteractionControllerDelegate

NSURL *URL = [[NSBundle mainBundle] URLForResource:@"Your PDF Name" withExtension:@"pdf"];
UIDocumentInteractionController *documentInteractionController =[UIDocumentInteractionController interactionControllerWithURL:URL];
documentInteractionController.delegate = self;
[documentInteractionController presentPreviewAnimated:YES];

- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller {
return self;
}

If you have any confusion, click on the below link and read : https://developer.apple.com/library/ios/documentation/FileManagement/Conceptual/DocumentInteraction_TopicsForIOS/Articles/PreviewingandOpeningItems.html