detect a touch down event on UIImageView(s)
<p>I placed 4 UIImageView on UIView and I named them </p>

<pre><code>UIImageView myImg1 = [[UIImageView alloc] init];     
UIImageView myImg2 = [[UIImageView alloc] init];     
UIImageView myImg3 = [[UIImageView alloc] init]; 
UIImageView myImg4 = [[UIImageView alloc] init];
</code></pre>

<p>How can I tell the compiler that I have just touched down UIImageView 1 or UIImaveView 2. If I only can use UIImageView to do this task, not buttons at all. Please guide me about this issue. Thanks</p>
