UIDocumentInteractionController...

UIDocumentInteractionController...

add delegate in .h  <UIDocumentInteractionControllerDelegate>

- (IBAction)termsActionBtn:(id)sender {

    

     NSURL *URL = [[NSBundle mainBundle] URLForResource:@"Terms and conditions" withExtension:@"pdf"];

    

    if (URL) {

        self.documentController = [UIDocumentInteractionController interactionControllerWithURL:URL];

        [self.documentController setDelegate:self];

        [self.documentController presentPreviewAnimated:YES];

    }

}

- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller{

    return self.navigationController;

}