If TextFields are empty, then do this for iPhone
<p>I have a simple calculator that works, but my problem is if the user doesn't input any data into the fields then it still calculates. I thought I could do the following:</p>

<pre><code>if (txtUserName.text == nil || txtUserName2.text == nil || txtUserName3.text == nil || txtUserName4.text == nil || txtUserName5.text == nil)
    {
        //error message 
        lblUserTypedName.text =@"Error - No Field Input";
    }
    else
    {
    lblUserTypedName.text = [[NSString alloc] initWithFormat: @"%2.1f%%", ultimate_risk];
    }
</code></pre>

<p>But it's not working at all. Any help letting me know what I am missing here would be greatly appreciated. I would like to use the || so even if they input all fields except one this will still catch it.</p>
