How to recursively unzip a file in Objective C using ZipZap. self.course_data is a NSData object that holds the zip file, coming from a NSURLConnection callback. This is stuff you can ignore.

gistfile1.m

-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
    self.progressLabel.text = @"Unpacking...";
    connection = nil;
    
    // Save to disk, release memory
    NSString *temp_file_path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"/temp.zip"];
    [self.course_data writeToFile:temp_file_path atomically:YES];
    self.course_data = nil;
    
    // Unzip
    NSFileManager *file_manager = [NSFileManager defaultManager];
    ZZArchive *archive = [ZZArchive archiveWithContentsOfURL:[NSURL fileURLWithPath:temp_file_path]];

    for (NSUInteger i=0, count=archive.entries.count; i<count; i++) {
        ZZArchiveEntry* archiveEntry = archive.entries[i];
        NSString *unzip_target_path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:archiveEntry.fileName];
        
        NSLog(@"Target: %@", unzip_target_path);
        
        if (archiveEntry.fileMode & S_IFDIR) {  // check if directory bit is set
            NSLog(@"Creating folder.");
            [file_manager createDirectoryAtPath:unzip_target_path withIntermediateDirectories:NO attributes:nil error:nil];
        } else {
            NSLog(@"no folder maybe?");
            [archiveEntry.data writeToFile:unzip_target_path atomically:YES];
        }

        NSLog(@"---");
    }
    
    self.progressLabel.text = @"Finished.";
}