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我已经下载了一个文件(ZipSecretExcel.zip),它存储在文档目录中。我现在正在尝试使用 ZipArchieve 使用以下代码在文档目录中解压缩此文件:

 NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES) objectAtIndex:0];

     NSString *zipFilePath = [documentsDirectory stringByAppendingPathComponent:@"ZippSecretExcel.zip"];

     NSString *output = [documentsDirectory stringByAppendingPathComponent:@"UnZipSecret"];

     ZipArchive* za = [[ZipArchive alloc] init];

     if( [za UnzipOpenFile:zipFilePath] ) {
     if( [za UnzipFileTo:output overWrite:YES] != NO ) {
     //unzip data success
     //do something
     //NSLog(@"Folder successfully zipped");
     }

     [za UnzipCloseFile];
     }

但是,文件夹成功压缩日志消息永远不会被打印,这意味着解压缩失败。谁能告诉我我做错了什么?

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