What does this mean? initWithFrame:CGRectZero]
<p>I created switch in cellForRowAtIndexPath like this.</p>

<p>UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectZero];</p>

<p>CGRectZero is equivalent to CGRectMake(0,0,0,0).
But, switch is seen in normal size. 
I didn't specified actuall size.
Please explain to me how above code works.</p>
