Try this,
NSFileManager *filemgr;
NSArray *dirPaths;
NSString *docsDir;
NSString *newDir;
filemgr =[NSFileManager defaultManager];
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
docsDir = dirPaths[0];
newDir = [docsDir stringByAppendingPathComponent:@"/myPictures"];
if(![filemgr fileExistsAtPath:newDir])
{
NSData *data = [NSData dataWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingString:@"/myPictures"]];
NSError *error;
[[NSFileManager defaultManager] createDirectoryAtPath:[docsDir stringByAppendingPathComponent:@"/myPictures"] withIntermediateDirectories:YES attributes:nil error:&error];
[data writeToFile:newDir atomically:YES];
}