UIImage Resizing

// 리사이징.
UIImage *img_mae = [UIImage imageNamed:@"hoge.png"];  // 리사이징전
UIImage *img_ato;  // 후
CGFloat width = 100;  // 후폭
CGFloat height = 200;  // 후높이.

UIGraphicsBeginImageContext(CGSizeMake(width, height));
[img_mae drawInRect:CGRectMake(0, 0, width, height)];
img_ato = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();