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copied!<p>You have to load one view, then check orientation and load another if needed. You check orientation in <code>shouldAutorotateToInterfaceOrientation:</code> returning yes if you want to rotate.</p> <p>I use a navigation controller to manage the transition. If I have the portrait view up and the device rotates, I push the landscape view and then pop the landscape view when it return to portrait. </p> <p>Edit:</p> <blockquote> <p>I return YES for all orientations in shouldAutorotateToInterfaceOrientation: but will this be called when the app launches? Do you push your view inside of this function?</p> </blockquote> <p>The orientation constants are not globals you query but rather part of the messages sent the controller by the system. As such, you cannot easily detect orientation before a view controller loads. Instead, you hardwire the app to start in a particular orientation (usually portrait) and then immediately rotate. (See mobile Safari. It always starts in portrait and then rotates to landscape.)</p> <p>These are the two methods I used to swap out my portrait and landscape views. </p> <p>All three view controllers have this method:</p> <pre><code>- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } </code></pre> <p>The portrait has this:</p> <pre><code>- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { if (toInterfaceOrientation==UIInterfaceOrientationLandscapeRight) { [self.nav pushViewController:rightLVC animated:NO]; } if (toInterfaceOrientation==UIInterfaceOrientationLandscapeLeft) { [self.nav pushViewController:leftLVC animated:NO]; } } </code></pre> <p>Each landscape controller has this:</p> <pre><code>- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { if (toInterfaceOrientation==UIInterfaceOrientationPortrait) { [self.nav popViewControllerAnimated:NO]; } </code></pre> <p>The app starts in portrait. If the orientation of the device is landscape, it pushes the appropriate landscapes. When the device rotates back to portrait, it pops the landscape. To the user it looks like the same view reorganizing itself for a different orientation. </p>

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