Is there a way to tell if a new controller came from a navigation back button or was pushed onto the stack? Id like to reload data only for pushing on the navigation stack, not
You could implement the UINavigationControllerDelegate and override the `navigationController:didShowViewController:animated:' method. You'll then have to check the returned view controller to make a determination as to whether you came back from the expected view controller.
- (void)navigationController:(UINavigationController*)navigationController didShowViewController:(UIViewController*)viewController animated:(BOOL)animated
{
if (yourPushedViewController == viewController)
{
// Do something
}
}
If your push also includes instantiating the view controller, put your push-only logic in viewDidLoad
. It will not be called on back because it has already been loaded.
As of iOS 5.0 you can do this:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if (self.isBeingPresented || self.isMovingToParentViewController) {
// "self" is being shown for the 1st time, not because of a "back" button.
}
}