而在VFR阅读器加载PDF在ios中得到错误

它不工作，因为我没有在项目中使用ARC，这里是我的代码

下载并保存pdf

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *comicbook_id = [[NSUserDefaults standardUserDefaults]stringForKey:@"comicbook_id"]; NSString *filePath = [NSString stringWithFormat:@"%@/book_%@.pdf", documentsDirectory,comicbook_id]; 

在向我的读者撤回时，我继续

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *comicbook_id = [[NSUserDefaults standardUserDefaults]stringForKey:@"comicbook_id"]; NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"book_%@.pdf",comicbook_id]]; NSLog(@"date==>%@",documentsDirectory); NSString *phrase = nil; ReaderDocument *document = [ReaderDocument withDocumentFilePath:filePath password:phrase]; NSLog(@"document==>%@",document); if (document != nil) { ReaderViewController *readerViewController = [[ReaderViewController alloc] initWithReaderDocument:document]; readerViewController.delegate = self; readerViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; readerViewController.modalPresentationStyle = UIModalPresentationFullScreen; [self presentViewController:readerViewController animated:YES completion:nil]; }