NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString *pdfFilePath =[basePath stringByAppendingPathComponent:@"myPDF.pdf"];
NSLog(@"pdf file %@",pdfFilePath);
NSArray *paths = NSSearchPathForDirectoriesInDo