ZipArchive を使用する必要があると思います:
ZipArchive* za = [[ZipArchive alloc] init];
NSData *Data = [NSData dataWithContentsOfURL:url]; // here url is your zip url
NSArray *documentPathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirString = [documentPathArray objectAtIndex:0];
NSString *filePath = [documentsDirString stringByAppendingPathComponent:@"temp.zip"];
NSURL *fileURL = [NSURL fileURLWithPath:filePath];
NSError *writeError = nil;
[Data writeToURL: fileURL options:0 error:&writeError];
if( writeError) {
NSLog(@" Error in writing file %@' : \n %@ ", filePath , writeError );
return;
}
if( [za UnzipOpenFile:filePath] )
{
BOOL ret = [za UnzipFileTo:documentsDirz overWrite:YES];
if( NO==ret )
{
NSLog(@"NO");
}
[za UnzipCloseFile];
}
詳細については