Zip/Unzip files on iPhone/iPad/iOS

1. Download ZipArchive from http://code.google.com/p/ziparchive/downloads/list.
2. Drag into project.
3. Add to project existing framework libz.1.2.3.dylib (last version).
4. Import to project:
   

   #import "ZipArchive.h"
   

5. Uncompress zip file example:
   

   NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
   
   NSString *zipFilePath = [documentsDirectory stringByAppendingPathComponent:@"myZipFileName.zip"];
   
   NSString *output = [documentsDirectory stringByAppendingPathComponent:@"unZipDirName"];
   
   ZipArchive* za = [[ZipArchive alloc] init];
   
   if( [za UnzipOpenFile:zipFilePath] ) {
       if( [za UnzipFileTo:output overWrite:YES] != NO ) {
           //unzip data success
           //do something
       }
   
       [za UnzipCloseFile];
   }
   
   [za release];
   

6. Compress directory or file example:
   

   BOOL isDir=NO;
   
   NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
   
   NSArray *subpaths;
   
   NSString *toCompress = [NSString stringWithString:@"dirToZip_OR_fileNameToZip"];
   NSString *pathToCompress = [documentsDirectory stringByAppendingPathComponent:toCompress];
   
   NSFileManager *fileManager = [NSFileManager defaultManager]; 
   if ([fileManager fileExistsAtPath:pathToCompress isDirectory:&isDir] && isDir){
       subpaths = [fileManager subpathsAtPath:pathToCompress];
   } else if ([fileManager fileExistsAtPath:pathToCompress]) {
       subpaths = [NSArray arrayWithObject:pathToCompress];
   }
   
   NSString *zipFilePath = [documentsDirectory stringByAppendingPathComponent:@"myZipFileName.zip"];
     
   ZipArchive *za = [[ZipArchive alloc] init];
   [za CreateZipFile2:zipFilePath];
   if (isDir) {
       for(NSString *path in subpaths){  
           NSString *fullPath = [pathToCompress stringByAppendingPathComponent:path];
           if([fileManager fileExistsAtPath:fullPath isDirectory:&isDir] && !isDir){
               [za addFileToZip:fullPath newname:path];  
           }
       }
   } else {
       [za addFileToZip:pathToCompress newname:toCompress];
   }
   
   BOOL successCompressing = [archiver CloseZipFile2];