iOS网络之07文件的压缩与解压缩

文件压缩与解压缩：（用到框架SSZipArchive-master）

注意：需要引入libz.dylib框架

• 1，文件压缩比较简单，直接用框架创建对象，然后传入需压缩文件地址和目标文件地址即可（注意：这个压缩是同步压缩，可以有返回值），如果需要设置密码，换另外一种创建方法即可
• 方法

//传入所有文件路径，是一个数组
    + (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)filenames;
//传入文件夹路径，是一个字符串
    + (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath;

• 使用：

    //需压缩文件地址
    NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    //目标文件地址
    NSString *images = [caches stringByAppendingPathComponent:@"images.zip"];

    [SSZipArchive createZipFileAtPath:images withContentsOfDirectory:caches];

• 2，解压缩也差不多：第一个方法不设置密码，第二个方法设置密码

• 方法：

//直接接压缩即可，暂时不明白最后一个Id是干嘛的
    + (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination  uniqueId:(NSString *)uniqueId;
    + (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination overwrite:(BOOL)overwrite password:(NSString *)password error:(NSError **)error  uniqueId:(NSString *)uniqueId;
//需要用到代理方法
    + (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination delegate:(id<SSZipArchiveDelegate>)delegate  uniqueId:(NSString *)uniqueId;
    + (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination overwrite:(BOOL)overwrite password:(NSString *)password error:(NSError **)error delegate:(id<SSZipArchiveDelegate>)delegate uniqueId:(NSString *)uniqueId;

• 使用：

    NSURL *url = [NSURL URLWithString:@"http://192.168.1.100:8080/MJServer/resources/videos/zhang.zip"];

    NSURLSessionDownloadTask *task = [[NSURLSession sharedSession] downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
        [SSZipArchive unzipFileAtPath:location.path toDestination:caches uniqueId:@"1"];
        
        NSLog(@"zhang");
    }];
    [task resume];

• 3，通过代理方法监听压缩或者解压缩的过程

//将要开始解压缩
- (void)zipArchiveWillUnzipArchiveAtPath:(NSString *)path zipInfo:(unz_global_info)zipInfo{
    NSLog(@"%@---zipArchiveWillUnzipArchiveAtPath",path);
}
//将要解压缩压缩文件中的第fileIndex个文件
- (void)zipArchiveWillUnzipFileAtIndex:(NSInteger)fileIndex totalFiles:(NSInteger)totalFiles archivePath:(NSString *)archivePath fileInfo:(unz_file_info)fileInfo{
    NSLog(@"zipArchiveWillUnzipFileAtIndex---%ld",(long)fileIndex);
}
//压缩文件中的第fileIndex个文件解压完成
- (void)zipArchiveDidUnzipFileAtIndex:(NSInteger)fileIndex totalFiles:(NSInteger)totalFiles archivePath:(NSString *)archivePath fileInfo:(unz_file_info)fileInfo{
    NSLog(@"zipArchiveDidUnzipFileAtIndex");
}
//全部解压完成
- (void)zipArchiveDidUnzipArchiveAtPath:(NSString *)path zipInfo:(unz_global_info)zipInfo unzippedPath:(NSString *)unzippedPat uniqueId:(NSString *)uniqueId{
    NSLog(@"zipArchiveDidUnzipArchiveAtPath");
}