Question

I’m trying to support landscape mode in my gl iOS application. I have a window, a gl view, and a view controller with one method, shouldAutorotateToInterfaceOrientation, which returns YES. This is how I set them up:

 window = [[UIWindow alloc] initWithFrame:rect];

 GLView *glView = [[GLView alloc] initWithFrame:rect];
 glView.delegate = self;

 view_controller = [ViewController alloc];
 view_controller.view = glView;
 window.rootViewController = view_controller;

This happens on the method applicationDidFinishLaunching. The problem is that the method shouldAutorotateToInterfaceOrientation gets called only once, for the portrait mode. I still get events on my view, but the method for auto rotate never gets called again.

Am I setting this up right? There are no nib files, just code.

Thanks.

Answer 1

You should be calling init on your ViewController instance (is it a UIViewController subclass?)

You should be overriding the following UIViewController methods

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation

The call to should autorotate does not mean that the rotation will take place, this is explained in the UIViewController class reference

By default, the UIViewController class displays views in portrait mode
only. To support additional orientations, you must override the
shouldAutorotateToInterfaceOrientation: method and return YES for any
orientations your subclass supports. If the autoresizing properties of
your views are configured correctly, that may be all you have to do.
However, the UIViewController class provides additional hooks for you
to implement additional behaviors as needed.

To temporarily turn off features that are not needed or might
otherwise cause problems during the orientation change, you can
override the willRotateToInterfaceOrientation:duration: method and
perform the needed actions there. You can then override the
didRotateFromInterfaceOrientation: method and use it to reenable those
features once the orientation change is complete.

To add animations for an orientation change, override the
willAnimateRotationToInterfaceOrientation:duration: method and perform
your animations there.