-( void )removeImagesFromDocumentDic{ /* dir: the directory where your files are */ NSFileManager *fm = [ NSFileManager defaultManager ]; NSError *error = nil ; NSString *docDirPath = [ NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory , NSUserDomainMask , YES ) objectAtIndex : 0 ]; NSArray *items = [fm contentsOfDirectoryAtPath :docDirPath error :&error]; if (error) { /* ... */ } /* delete png files */ for ( NSString *item in items) { if ([[item pathExtension ] isEqualToString : @"png" ]) { NSString *path = [docDirPath stringByAppendingPathComponent :item]; [fm removeItemAtPath :path error :&error]; if (error) ...