Simulate Memory Warning in Tab Bar with Navigation Controller application

[ghulam.mustafa]

Background: I have a tab bar application. Each tab contains navigation controller allowing the user to transition from one view to the other showing a drill down information of the data (each view is being handled by a view controller and each view controller class has -didReceiveMemoryWarning method). Lists are populated by pulling the data from web services.

Problem: When i use "Hardware > Simulate Memory Warning" option of iPhone Simulator, the -didReceiveMemoryWarning method is called for ALL my view controllers - even the one which the user is viewing. I don't want to clear any content which is being used by the active view controller. How can i achieve that?

Which method should have the implementation to reload the data after the data was released because of memory warning? (I see that the view controller classes that contain a table view call -viewDidLoad method when user comes back to that view, but if the view contains (say UIWebView) then -viewDidLoad method is not called. Why is that?)

Thanks.