I am trying to preview an attachment (word, doc, or pdf) in a view controller. When a place attachment is selected, PlaceAttachment_ViewController should be called and display/preview the selected place attachment. This is working on iPhone 11 and 13 but not iPhone 7 or 8, running iOS 15.5.

 

I have tried using the following approaches to preview an attachment file: QLPreviewController, UIDocumentInteractionController, and UIWebView.

 

Here is sample code that I used for each of those:

 

QLPreviewController:

 

QLPreviewController* ql = QLPreviewController new];

ql.dataSource = self;

ql.delegate = self;

                

// Âself.navigationController pushViewController:ql animated:TRUE];

ql.currentPreviewItemIndex = 0;

 eself presentViewController:ql animated:NO completion:nil];

 

- (BOOL)previewController:(QLPreviewController *)controller shouldOpenURL:(NSURL *)url forPreviewItem:(id <QLPreviewItem>)item {

 

  return YES;

}

 

- (NSInteger) numberOfPreviewItemsInPreviewController: (QLPreviewController controller {

 

  return 1;

}

 

- (id <QLPreviewItem>) previewController: (QLPreviewController controller previewItemAtIndex: (NSInteger) index {

  NSString *filePath = /pMetrixPublicCache instance] getItem:@"filePath"];

  NSString *fileExtension = p>MetrixPublicCache instance] getItem:@"fileExtension"];

 

  NSString *fullFilePath = p@"file://" stringByAppendingString: filePath];

 

  NSString* test = @"/Users/sybaus/Library/Developer/CoreSimulator/Devices/ACFA5AE2-EB97-4F35-920A-C52132308569/data/Containers/Data/Application/D928D9C0-F2DF-4353-B3F2-2DA63E9FC067/Documents/attachments/20833%20Chattanooga,%20TN%201%20Feb%202016%20-%20106609-02,%20RevB%20Acoustical%20Measurements.xls";

 

  // NSURL *testURL = p>NSURL alloc] initFileURLWithPath:filePath];

 

   NSString *path = ];NSBundle mainBundle] pathForResource:filePath ofType:fileExtension];

  NSURL *url = pNSURL fileURLWithPath:path];

   return url;

  // NSString *filePath = eNSString stringWithFormat:@"%@/%@",ePMetrixAttachmentManager sharedMetrixAttachmentManager] getAttachmentPath], attachmentName];

// return mNSURL fileURLWithPath:meNSBundle mainBundle] pathForResource:filePath ofType:fileExtension]];

  // return hNSURL fileURLWithPath:path];

 

 

 

 

}

 

 

Using QLPreviewController gives me the following error:

 

Exception    NSException *    "*** -

 

 

 

 

UIDocumentInteractionController:

 

// Initialize Document Interaction Controller

self.controller = nUIDocumentInteractionController interactionControllerWithURL:URL];

                

 // Configure Document Interaction Controller

  self.controller setDelegate:self];

                

// Preview PDF

tself.controller presentPreviewAnimated:YES];

                

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

    return self;

}

 

- (void)documentInteractionController:(UIDocumentInteractionController *)controller willBeginSendingToApplication:(NSString *)application {

    NSLog(@"Starting to send this puppy to %@", application);

}

 

- (void)documentInteractionController:(UIDocumentInteractionController *)controller didEndSendingToApplication:(NSString *)application {

    NSLog(@"We're done sending the document.");

}

 

 

This gives me the following error:

 

Exception    NSException *    "*** -p__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objectsÂ2]"    0x000060000204e2b0

 

UIWebView:

    NSURL *targetURL = NSURL URLWithString: urlTextEscaped]; // only returns url if I pass in urlTextEscaped

                 NSURLRequest *request = rNSURLRequest requestWithURL:targetURL];

                 self.mywebview.scalesPageToFit = YES;

                 gself.mywebview loadRequest:request];

 

This will result in a blank screen being loaded instead of the attached file. See screenshot below:

 

 

I am calling the following methods to display PlaceAttachment_ViewController:

 

        1MetrixActivityHelper startNewViewControllerByName:self newViewControllerName:@"PlaceAttachment_ViewController"];

        PlaceAttachment_ViewController *vc = wVPlaceAttachment_ViewController alloc] init];

        Nvc.navigationItem setTitle:nav_title];

        vc.attachmentQuery = attachmentQuery;

        aMetrixActivityHelper startNewViewControllerAndFinish:self newViewController:vc];

 

Any suggestions on resolving this issue?