UIImage用imageNamed的内存有关问题

UIImage用imageNamed的内存问题
@implementation UIImage(imageNamed_Hack)

+ (UIImage *)imageNamed:(NSString *)name {
    NSString *path = [NSString stringWithFormat:@"%@/%@",
                      [[NSBundle mainBundle] bundlePath],
                      name];
    return [UIImage imageWithContentsOfFile:path];
}

@end