Get file path and URL for file in temp directory

NSTemporaryDirectory() provides a full path to the temporary directory. Instead of using your mainBundle have you tried

NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"temp.pdf"];

If you need a URL instead, do this:

NSURL *furl = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:@"temp.pdf"]];