Zip-Unzip in ios, iPhone, iPad,mac-osX

An Very good library to zip/uzip files using objective-c.
You can also unzip password protected file using this utility.
steps to use...
1)Download it from http://code.google.com/p/ziparchive/
2)include minizip folder and ZipArchive.h and ZipArchive.m files into your project.
3) import ZipArchive.h in your class and then call approprite methods of ZipArchive to zip/unzip.

for example:
//to create zipfile
 -(BOOL) CreateZipFile2:(NSString*) zipFile;
//to create password protected zipfile

-(BOOL) CreateZipFile2:(NSString*) zipFile Password:(NSString*) password;

////to addFile To zipfile

-(BOOL) addFileToZip:(NSString*) file newname:(NSString*) newname;

//closing zip

-(BOOL) CloseZipFile2;

//unziping zip file

-(BOOL) UnzipOpenFile:(NSString*) zipFile;

//unzip password protected zip file

-(BOOL) UnzipOpenFile:(NSString*) zipFile Password:(NSString*) password;

-(BOOL) UnzipFileTo:(NSString*) path overWrite:(BOOL) overwrite;

-(BOOL) UnzipCloseFile;

//Demo code.

//Unziping File

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

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,

                                                         NSUserDomainMask,

                                                         YES);

    

    NSString *zipFile = [[paths lastObject] stringByAppendingPathComponent:@"abcd.zip"];

    NSString *extractedFile = [[paths lastObject] stringByAppendingPathComponent:@"Extracted"];

    if( [zipArchive UnzipOpenFile: zipFile Password:@"mypassword"] )

    {

        BOOL ret = [zipArchive UnzipFileTo:extractedFile overWrite:YES];

        if( NO==ret )

        {

            UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Error" message:[NSString stringWithFormat:@"Unable to unzip."] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];

            [alert show];

            [alert release];

            [zipArchive release];

            return false;

        }

        [zipArchive UnzipCloseFile];