title: UIScrollView will not scroll, even after content size set
body: <p>My UIScrollView is a ~4500px horizontal view that the user needs to scroll horizontally through to view the content.</p>
  
  <p>I have set it up as follows:</p>
  
  <pre><code>- (void)viewDidLoad
  {
  
      [super viewDidLoad];
  
      sview.frame = CGRectMake(0, 0, 568, 320);
      sview.contentSize = CGSizeMake(4500, 320);
      [sview setScrollEnabled:YES];
  }      
  </code></pre>
  
  <p>Yet the scroll view does nothing. Is there something obvious I missed? i've tried literally every tutorial on the web. </p>