PushView controller and PopView controller in iPhone app.

UISelectCategoryController *selectCategory;

PushView Controller:-

-(IBAction)btnNext_TouchUpInside:(id)sender{

selectCategory = [[UISelectCategoryController alloc]initWithNibName:@"SelectCategoryView" bundle:nil];

[self.navigationController pushViewController:selectCategory animated:YES];

}

PopView Controller:-

-(IBAction)btnBack_TouchUpInside:(id)sender{

[self.navigationController popViewControllerAnimated:YES];

}

popToView Controller:- 

-(IBAction)btnLocation_TouchUpInside:(id) sender{

NSArray *viewController = [self.navigationController viewControllers];

[self.navigationController popToViewController:[viewController objectAtIndex:1] animated:YES];

}

popToRootView Controller:-

-(IBAction)btnLogOut_TouchUpInside:(id)sender

{

[self.navigationController popToRootViewControllerAnimated:YES];

}