Question

I got two viewControllers using a navigation bar. The first viewController displays some data I change on the second viewController.

So if I load the second viewController, a back button appears in the NavBar and I can change my values (and they are stored, I used the debugger). My problem is, after hitting the backButton to come to my firstView Controller, it does not call it’s viewDidLoad method. It’s clear, that there are no updated values at all, when this function is not called.

At the first start, the viewDidLoad method is called and does what I want it to do. After going back and forth between the viewControllers the method is not called again.

Any solutions?

Thanks!

EDIT:

SOLVED

I did not want to delete my question, maybe someone needs this too:

This method is called every time the view appears, it is probably not defined by default:

-(void)viewDidAppear:(BOOL)animated
{
NSLog(@"View appeared.");
}

Answer 1

But the update code (like [[self view] setNeedsDisplay];) in viewWillAppear.

To make it clear: viewDidLoad is called when your view is loaded. This happens at the first time the view is going to be displayed. When you then navigate to the next view the first view can (depending on your code) still be loaded. Therefore when you navigate back to that view viewDidLoad won’t be called because the view is still there.

But every time the view is going to be shown (for example when you navigate back to this view) the method viewWillAppear and viewDidAppear will be called.

Hope that helps.