memory management on back 
<p>I am new to iPhone development.
I have an application with custom tab bar.
I am calling Back Button Method on my back button.
Here it is :</p>

<pre><code>-(void)backBtnPessed
{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"GeneralViewController" object:nil];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"SchoolViewController" object:nil];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"WorkViewController" object:nil];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"FavoriteViewController" object:nil];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"ContactViewController" object:nil];
    [self.navigationController popViewControllerAnimated:YES];
}
</code></pre>

<p>On every NSNotificationCenter, I am deallocation all objects of that file.
My Question is when I am checking in instrument , that objects are not deallocating.
So what should i do now?
Please help me. Thanking you...</p>
