View rotation notifications: why didRotateFromInterfaceOrientation: doesn't get called? - iphone

Question

I'm trying to detect any device orientation change so that I can update the views.
I want to update the views whether the orientation is portrait or landscape, so I implemented this method:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}
I know that if I want to update the views to show properly for the current orientation, I will need to implement some of the following methods:
– willRotateToInterfaceOrientation:duration:
– willAnimateRotationToInterfaceOrientation:duration:
– didRotateFromInterfaceOrientation:
– willAnimateFirstHalfOfRotationToInterfaceOrientation:duration:
– didAnimateFirstHalfOfRotationToInterfaceOrientation:
– willAnimateSecondHalfOfRotationFromInterfaceOrientation:duration:
Now, the problem is that I don't understand why none of these methods get fired when I rotate the simulator.
I tried as well this piece of code:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
But still nothing. So I'm wondering, does the simulator fire rotation notifications?
If yes, what am I doing wrong?

Answer 1

You need to add notification observer something like
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(didRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];
and add the method
- (void) didRotate:(NSNotification *)notification
{
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
if (orientation == UIDeviceOrientationLandscapeLeft)
{
NSLog(#"Landscape Left!");
}
}

Answer 2

Quick summary, change this:
[window addSubview:viewController.view];
to this:
[window setRootViewController:viewController];
I'm sorry if I took somebody's time for a silly mistake of mine. I found out why the method – willRotateToInterfaceOrientation:duration: would never get called. Something brought my attention to the navigation controller:
Only the root view controller's willRotate method is being called. Most likely you have a strange hierarchy of view controllers.
I found these post in another forum and I had a look at the app delegate. My code was as follows:
CGRect bound = [[UIScreen mainScreen] bounds];
window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, bound.size.width, bound.size.height)];
TestViewController *viewController = [[TestViewController alloc] init];
[window addSubview:viewController.view];
[viewController release];
[self.window makeKeyAndVisible];
The problem was that I was not setting any view controller for the window, but I was just adding a view. It was a mistake I did due to the hurry to test something. I had to fix the code like this:
CGRect bound = [[UIScreen mainScreen] bounds];
window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, bound.size.width, bound.size.height)];
TestViewController *viewController = [[TestViewController alloc] init];
[window setRootViewController:viewController];
[viewController release];
[self.window makeKeyAndVisible];