iOS-下载并解压Zip文件

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项目开发中，有时候需要下载Zip类文件，并对其解压。

步骤如下：

下载ZipArchive库

下载ZipArchive库，并将其添加到项目中，注意ZipArchive.mm是非ARC文件，需要加上“-fno-objc-arc”编译位。

添加libz.tbd库

添加系统库libz.tbd，ZipArchive依赖该库，如果没添加，在调用时，会报错：

Undefined symbols for architecture i386:
      "_crc32", referenced from:
          _unzReadCurrentFile in unzip.o
          -[ZipArchive addFileToZip:newname:] in ZipArchive.o
          _zipWriteInFileInZip in zip.o
      "_deflate", referenced from:
          _zipWriteInFileInZip in zip.o
          _zipCloseFileInZipRaw in zip.o
      "_deflateEnd", referenced from:
          _zipCloseFileInZipRaw in zip.o
      "_deflateInit2_", referenced from:
          _zipOpenNewFileInZip3 in zip.o
      "_get_crc_table", referenced from:
          _unzOpenCurrentFile3 in unzip.o
          _zipOpenNewFileInZip3 in zip.o
      "_inflate", referenced from:
          _unzReadCurrentFile in unzip.o
      "_inflateEnd", referenced from:
          _unzCloseCurrentFile in unzip.o
      "_inflateInit2_", referenced from:
          _unzOpenCurrentFile3 in unzip.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

调用

利用NSURLSession进行下载，完成后解压。

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- (void)downloadAndUnzip
{
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration ephemeralSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];
    _task = [session downloadTaskWithRequest:[[NSURLRequest alloc] initWithURL:[[NSURL alloc] initWithString:@"http://...zip"]] completionHandler:
    ^(NSURL *location, NSURLResponse *response, NSError *error) {
        ZipArchive *za = [ZipArchive new];
        if([za UnzipOpenFile:location.path]){
            if([za UnzipFileTo:文件夹名 overWrite:YES]){
            	//解压后的路径为：文件夹名/文件名
            }
        }
    }];
    [_task resume];
}