title: ios horizontal scroll menu - background buttons select
body: <p>I try to make an horizontal navigation menu in scrollView. For every items in the menu i had a different image. When i select an item, i would like to change background image of this item, but i don't know why my code doesn't work:</p>
  
  <pre><code>for (int i=0; i&lt;12; i++) {
              UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
              UIImage *normal=[UIImage imageNamed:@"icon1"];
              UIImage *selec=[UIImage imageNamed:@"icon1down"];
              [btn setFrame:CGRectMake(i*larg, 0, 42.0, 43.0)];
              [btn setBackgroundImage:normal forState:UIControlStateNormal];
              [btn setBackgroundImage:selec forState:UIControlStateSelected];
  
              [scrollCat addSubview:btn];
              cx+=42.0;
      }
      [scrollCat setContentSize:CGSizeMake(cx, 43)];
  </code></pre>
  
  <p>Is there a bad thing in this code?</p>