Hi.I am making an app that it takes photos from web site for some Username and shows it on UITable with username then when clicking user name it shows photos for this user and then clicking to name of photo it shows full screen photo.

My question is I am using NSData to get photos from internet.Am I have to save also those data to CoreDAta? I am using like when pressing name of user it again creates NSData and downloads photos from internet and shows them on UTable. And it takes time.

What is good approach? and How can save this images to CoreDAta?

I am using this method

NSData *imageData=[flickr dataForPhotoID:firstPhoto.id fromFarm:firstPhoto.farm 
onServer:firstPhoto.server withSecret:firstPhoto.secret inFormat: 
FlickrFetcherPhotoFormatSquare];

and here definition of dataForPtohoID method

- (NSData *)dataForPhotoID:(NSString *)photoID fromFarm:(NSString *)farm   
   onServer:(NSString *)server withSecret:(NSString *)secret 
 inFormat:(FlickrFetcherPhotoFormat)format {

#if TEST_HIGH_NETWORK_LATENCY
sleep(1);
#endif

NSString *formatString;

switch (format) {
    case FlickrFetcherPhotoFormatSquare:    formatString = @"s"; break;
    case FlickrFetcherPhotoFormatLarge:     formatString = @"b"; break;
}

NSString *photoURLString = [NSString stringWithFormat:@"http://farm%@.static.flickr.com/%@/%@_%@_%@.jpg", farm, server, photoID, secret, formatString];
NSURL *url = [NSURL URLWithString:photoURLString];

return [NSData dataWithContentsOfURL:url];
}