Iphone device orientation

Question

Hi,
I am facing strange problem with UIDevice setOrientation method and I will really appreciate if someone could solve this problem.
I am navigating between two view controllers thru push and pop. Screen A is list of image series and Screen B display images in scrollview of that series. For a particular series I want to show images in landscape mode so I use
Code:
[[UIDevice currentDevice] setOrientation:UIDeviceOrientationLandscapeLeft];
in viewDidAppear method of Screen B.
This works fine and Interface is rotated to landscape. Please note device is still held as portrait.
Now if I go back to screen A by "POP", Screen A is displayed as landscape orientation, device is still in portrait. Although shouldAutorotateToInterfaceOrientation method return true on A screen then why it is not rotating to portrait, since device is held as portrait.
shouldAutorotateToInterfaceOrientation on screen B restrict the interface orientation to landscape.
I have spent more than two days now to solve this out but couldn't find a solution. plz help.
Thanks in advance.

Answer 1

I'm not sure what you may be doing wrong. In my apps, I generally lock down one orientation, but after seeing your post when I next looked at the UIViewController Class Reference which you can reach by right-click or control-click on any UIVuewController class or method name in your code and select find in API reference,
I found this:{quote}Handling View Rotations
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.
If you want to perform custom animations during an orientation change, you can do so in one of two ways. Orientation changes used to occur in two steps, with notifications occurring at the beginning, middle, and end points of the rotation. However, in iPhone OS 3.0, support was added for performing orientation changes in one step. Using a one-step orientation change tends to be faster than the older two-step process and is generally recommended for any new code.
To add animations for a one-step orientation change, override the willAnimateRotationToInterfaceOrientation:duration: method and perform your animations there. To use the older two-step method, override one or both of the willAnimateFirstHalfOfRotationToInterfaceOrientation:duration: and willAnimateSecondHalfOfRotationFromInterfaceOrientation:duration: methods to configure your animations before each step. You must choose only one technique and override just the methods associated with that technique. If you override either method associated with the two-step technique, the view controller uses that technique by default.
{quote}
My take on that is that you may need to play around with overriding willRotateToInterfaceOrientation:duration and didRotateFromInterfaceOrientation.
These and some of the other available methods are not in the standard templates and you have to add them yourself. I'd say take a good look at the docs again and see if it explains the behavior you are seeing and then make your changes one at a time and see what changes.
I've learned the hard way that making a bunch of changes to something that worked and finding which thing broke some behavior is really hard unless you know exactly what set of changes will affect a specific behavior.
Let us know if this helps.