title: ios setting alpha to all objects on view
body: <p>In iOS 4.0.2, I would like to set the alpha to 0.00 for each object on the view that I has a tag of 100.  </p>
  
  <pre><code>  (id object in [self.view subviews])
       {   
       if ([object tag]  == 100)      
           {
  
            //what goes here ...
  
           }
        }
  </code></pre>