Cannot load files in UIDocumentInteractionController - objective-c

Question

I am building an app that allows the opening of a PDF, and handles this like so:
- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url sourceApplication:(NSString *)source annotation:(id)annotation
{
if (url != nil && [url isFileURL])
{
if ([[url pathExtension] isEqualToString:#"pdf"])
{
FilePreviewViewController *filePreviewController = [[FilePreviewViewController alloc] init];
[filePreviewController setURL:url];
[self.navController pushViewController:filePreviewController animated:NO];
return YES;
}
}
return NO;
}
And then in FilePreviewController.m:
-(void) setURL:(NSURL *) URL
{
self.documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:URL];
[self.documentInteractionController setDelegate:self];
[self.documentInteractionController presentPreviewAnimated:NO];
}
However, when I open a file and the view transitions, I get these messages:
Unbalanced calls to begin/end appearance transitions for <QLRemotePreviewContentController: 0x1581fe00>.
Couldn't issue file extension for path: /private/var/mobile/Containers/Data/Application/6399D00B-47A1-4F33-B34C-3F0B07B648AE/Documents/Inbox/pdf-8.pdf
And the file itself does not load. I'm not sure what I'm doing wrong because this works fine on the simulator (i.e. the PDF loads and displays perfectly).

Answer 1

use this code to view/read pdf format file.
.h
<UIDocumentInteractionControllerDelegate>
UIDocumentInteractionController *controller;
.m
NSString *File_name=[NSString stringWithFormat:#"%#",URL];
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *pngFilePath = [NSString stringWithFormat:#"%#/%#",docDir,[File_name lastPathComponent]];
NSData *pdfData = [[NSData alloc] initWithContentsOfURL:URL];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_async(dispatch_get_main_queue(), ^{
if (pdfData) {
[pdfData writeToFile:pngFilePath atomically:YES];
controller = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:pngFilePath]];
controller.delegate = self;
CGRect rect = CGRectMake(0, 0, appDelegate.wVal, appDelegate.hVal);
[controller presentOptionsMenuFromRect:rect inView:self.view animated:YES];
}
});
});