iPad app to start in landscape mode

问题:

I searched for other existing posts, but none of them satisfied my requirements.

Here is the problem i face,

1. My app supports both the Modes , landscape and portrait.
2. But my first screen only supports Landscape , so the app must start in Landscape.
3. I have set supported Orientation to all the 4 options
4. I have set the Initial interface orientation to Landscape (left home button)
5. In the view controller of the first screen i am defining the below

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

    {
        return (interfaceOrientation != UIInterfaceOrientationPortrait);
    }

And when i start the app the simulator always opens in Portrait and my view is all messed up in the portrait mode , since it is designed only for the landscape. After the switch to the Landscape, the device remains in this mode.

can anyone help me with the solution to avoid this ?

Thanks Naveen

EDITED :

This info may be helpful , The problem is faced only when i hold the device in Portrait and then launch the app.

Its not the duplication of this question, Landscape Mode ONLY for iPhone or iPad

Landscape Mode ONLY for iPhone or iPad

I do not want my app to be only in Landscape , i want only the first screen of my app to be only in Landscape.

回答1:

I did some experimenting with an app I'm working on that has the same requirements, and came up with the following:

1. To set the initial orientations that are supported when the app is first launched, use the "Supported Device Orientations" setting for your target. Also back that up with the appropriate shouldAutorotateToInterfaceOrientation code, as you've already done.

2. For subsequent screens, simply use the shouldAutorotateToInterfaceOrientation code to determine which orientations you want to support. Even if you've specified only landscape modes for the Supported Device Orientation, shouldAutorotateToInterfaceOrientation wins. :)

I think this approach is a little cleaner than using an extra dummy VC.

回答2:

I achieved a workaround for the Problem and it solved ,

I created a dummy view controller and added as the root view controller of the Window.

Added the below method in the implementation

    -(void)viewDidAppear:(BOOL)animated
    {
        WelcomeScreen *welcomeScreen = [[[WelcomeScreen alloc] initWithNibName:@"WelcomeScreen" bundle:nil] autorelease];
        [self presentModalViewController:welcomeScreen animated:NO];
    }

Now it worked as expected.

回答3:

Here is a SO link that will hopefully answer your question on how to launch your app in landscape mode.