IOS Opening PDF from my app in another app EXC_BAD_ACCESS - ios

Question

I'm having difficulty debugging this error. I get an EXC_BAD_ACCESS error after I click on Adobe or Nook as the selected app to open the download PDF. I've gone through with the debugger and it breaks somewhere outside of the methods I wrote. Here is the code in question.
//download protocol
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *storedEmail = [defaults stringForKey:#"email"];
NSString *storedPassword = [defaults stringForKey:#"password"];
NSString *projectID = self.study.ProjectID;
NSString *urlString = [NSString stringWithFormat:#"http://service.pharmatech.com/Document/projectprotocol/%#/%#/%#", storedEmail, storedPassword, projectID];
NSURL *url = [NSURL URLWithString:urlString];
NSData *data = [NSData dataWithContentsOfURL:url];
if (data) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:#"%#/%#", documentsDirectory, [NSString stringWithFormat:#"Protocol_%#.pdf", projectID]];
[data writeToFile:filePath atomically:YES];
UIDocumentInteractionController *docController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:filePath]];
docController.delegate = self;
docController.UTI = #"com.adobe.pdf";
self.navigationController.toolbarHidden = NO;
BOOL isValid = [docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
NSLog([NSString stringWithFormat:#"DISPLAYED? %d", isValid]);
NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:NULL];
for (int count = 0; count < (int)[directoryContent count]; count++) {
NSLog(#"File %d: %#", (count + 1), [directoryContent objectAtIndex:count]);
}
[self.navigationController setToolbarHidden:YES animated:YES];
The popup shows with the apps capable of showing pdfs. After I click one the Bad Access error occurs, but not until after leaving the method this is called in, which is just a button click action.
If I run the app w/o the debugger is simply closes the my app and opens nothing. Anyone have any tips. I'm still very new to this ios stuff.
EDIT: For those who visit this later and don't read the comments, the answer is that the UIDocumentInteractionController must be an instance variable, not local.

Answer 1

It seems to be a problem with "docController", is a local variable and, i think, must be a instance variable.
Change
UIDocumentInteractionController *docController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:filePath]];
for
docController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:filePath]];
and in your .h declare
UIDocumentInteractionController *docController;