Need Help on didRecieveMemoryWarning in iPhone
<p>I am developing an application which has almost 12 view controllers. Application has tabBar with 4 tabs means four view controllers and there are multiple views to navigate in each tab bar. Please note each tab has a navigationController with a rootviewController being its firstview. Application is an extensive database application. When I run on simulator it works nice but get didRecieve memory warning while running on the device. I have few questions regarding the same.</p>

<p><strong>NOTE: I have checked the application using Instruments tool for Leaks and there are no red pyramids which means there are no leaks in the code.</strong></p>

<ol>
<li><p>What is the best practise when you deal with multiple view controllers.</p></li>
<li><p>when I recieve memory warning, I call [self deleteObjects] which deletes all the instances which are retaning the values for the current controller. But I am not confident if this the right way. What should be done when we recieve memory warnings. Is there any good tutorial for that. (Links plz)</p></li>
<li><p>Also how to make sure that the [self deleteObjcts] is not called for the visible controller. 
(I was calling the deleteObjects method in viewDidUnload method before but since we do [super didRecieveMemoryWarning] it breaks the code as viewDidLoad is called in hierarch from top to bottom so once I deleted object for top viewController obviously there will be error for rest of the controllers.)</p></li>
</ol>

<p>Some of the basic confusing questions for me are as follows:</p>

<ol>
<li><p>Why the memory warnings are not consistent. Like I get them sometimes at the start whereas sometimes there are no warnings. </p></li>
<li><p>When we used [NSDate date], [UIImage imageNamed:@"..."], [NSString stringWithFormat] etc, we dont own these objects and we dont have to release them but how can we make sure these objects are relased when we recieve a memory warning.</p></li>
<li><p>I am using NSMutableArray at multiple places. In this arrays I store the [NSString StringWithFormat ], [UIImage imageNamed...] objects, so when I realease the arrays do I need to relase the objects in the arrays though I dont own them.</p></li>
</ol>

<p>Though this is a big list of question but I appreciate your help and time since I am in last stage of my development I am facing these major challenges.</p>
