PopViewController in Tabbar application - iphone

Question

I am working on a Tab-bar application.
TAB-BAR CONTROLLER
|
_______________________________________________________
| | | |
View 1 View 2 View 3 View 4
| |
SearchingON Detail View
Problem 1 :I have a button (Let say Sign Out), On click of The button which is on View 4, I want to pop the Detail view of View 2.
So that after new login new user should not reach to detail veiw.
I have tried :
if ([[NSUserDefaults standardUserDefaults] valueForKey:#"IsChattingON"])
{
ChatDetail *chat = [[ChatDetail alloc] initWithNibName:#"ChatDetail" bundle:nil];
[chat BackButtonClicked:nil];
}
and in Detail View back Button my code is :
-(IBAction)BackButtonClicked:(id)sender
{
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:#"IsChattingON"];
[self.navigationController popViewControllerAnimated:YES];
}
Here User Defaults having Bool value whether Detail View is open or not.
Problem 2 : I am applying Search on View 1's Table View and want to remove Search if View 4 SignOut button is clicked. I want to refresh my View 1 if Signout button of View 4 is clicked.
For removing Search I have done this code but not getting the desired results.
PeopleController *People = [[PeopleController alloc] initWithNibName:#"PeopleController" bundle:nil];
People.isSearchingRecords = NO;
I have Searched so far about popViewControllers but cant find this scene. Pls let me know how can I achieve this functionality.

Answer 1

You should not allocate a new view controller when the user taps on logout,
instead you should do the following
- (void) logOut
{
//get the view 2
//you should have a way to access view 2
[view2 closeChatView];
}
//On view 2 maintain a reference of chat detail controller
- (void) closeChatView
{
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:#"IsChattingON"];
//chat is the reference to the chat details controller
[chat.navigationController popViewControllerAnimated:YES];
}

Answer 2

I assume that you keep instance of navigation controllers in appDelegate then you can try this:
NSArray *viewNavStack = appDelegate.viewNavController.viewControllers;
if ([viewNavStack count] > 1) {
[appDelegate.overviewNavController popToRootViewControllerAnimated:NO];
}

Answer 3

Finally I got solution for Problem 2 :
I am setting a NSUserDefault BOOL to NO, and in ViewWillAppear I am getting that UserDefaults value whether searching is ON or not.
On click of Signout Button :
[[NSUserDefaults standardUserDefaults]setBool:NO forKey:#"SearchingON"];
and on View 1 :
isSearchingRecords = [[NSUserDefaults standardUserDefaults] boolForKey: #"SearchingON"];
if (isSearchingRecords)
{
self.btnSearchCancel.hidden = NO;
}else
{
self.btnSearchCancel.hidden = YES;
}
But cant find the solution of Problem 1 - to pop the view by another tab, if any one have any idea pls let me know !!