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POiOS 6: Parent modal's modalPresentationStyle ignored after rotation
 

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  1. POiOS 6: Parent modal's modalPresentationStyle ignored after rotation
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    <p>With iPad with iOS6, we have this bug where a modal view controller will expand to full screen, even if it is told to be using "form sheet" presentation style. But, this happens only if there are two modals, a parent one and its child.</p> <p>So this is how the first modal is created and presented:</p> <pre><code>UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:controller] autorelease]; navigationController.modalPresentationStyle = UIModalPresentationFormSheet; [parentController presentModalViewController:navigationController animated:YES]; // parentController is my application's root controller </code></pre> <p>This is how the child modal is created and presented:</p> <pre><code>UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:controller] autorelease]; navigationController.modalPresentationStyle = UIModalPresentationFormSheet; [parentController presentModalViewController:navigationController animated:YES]; // parentController is the navigationController from above </code></pre> <p>So when rotating from landscape to portrait, the parent modal will expand to full screen and remain that way even if we rotate back to landscape.</p> <p>When we have the parent modal all by itself (no child modal), then it works as expected, which is that it remains in form sheet style.</p> <p>Note that this happens on iOS6 only (device and simulator) and doesn't happen on iOS 5 (simulator and reported to work by testers).</p> <p>So far, I have tried the following without success:</p> <ul> <li>setting <code>wantsFullScreenLayout</code> to <code>NO</code></li> <li>forcing <code>wantsFullScreenLayout</code> to always return <code>NO</code> by overriding it</li> <li>Making certain my controllers inside the navigation controller also specify <code>UIModalPresentationFormSheet</code></li> <li>implementing <code>preferredInterfaceOrientationForPresentation</code></li> <li>upgrade to iOS 6.0.1</li> </ul> <p>Thanks!</p> <hr> <p><strong>UPDATE</strong>: So, I adapted the response from the Apple Developer Forums (<a href="https://devforums.apple.com/message/748486#748486" rel="noreferrer">https://devforums.apple.com/message/748486#748486</a>) so that it works with multiple nested modal.</p> <pre><code>- (BOOL) needNestedModalHack { return [UIDevice currentDevice].systemVersion.floatValue &gt;= 6; } - (void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { // We are the top modal, make to sure that parent modals use our size if (self.needNestedModalHack &amp;&amp; self.presentedViewController == nil &amp;&amp; self.presentingViewController) { for (UIViewController* parent = self.presentingViewController; parent.presentingViewController; parent = parent.presentingViewController) { parent.view.superview.frame = parent.presentedViewController.view.superview.frame; } } [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration]; } - (void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { // We are the top modal, make to sure that parent modals are hidden during transition if (self.needNestedModalHack &amp;&amp; self.presentedViewController == nil &amp;&amp; self.presentingViewController) { for (UIViewController* parent = self.presentingViewController; parent.presentingViewController; parent = parent.presentingViewController) { parent.view.superview.hidden = YES; } } [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration]; } - (void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { // We are the top modal, make to sure that parent modals are shown after animation if (self.needNestedModalHack &amp;&amp; self.presentedViewController == nil &amp;&amp; self.presentingViewController) { for (UIViewController* parent = self.presentingViewController; parent.presentingViewController; parent = parent.presentingViewController) { parent.view.superview.hidden = NO; } } [super didRotateFromInterfaceOrientation:fromInterfaceOrientation]; } </code></pre>
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    1. COSomebody pointed me to the apple developer forums and I found this: https://devforums.apple.com/message/748486
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    2. COPresenting multiple modals clearly breaks the way Apple say you should be doing things. If you end up doing things like this which go against Apple' advice then expect problems like this. Also consider you probably have a very bad design. If you want to show multiple viewControllers like this you should be using containment or a navigationController in a single modal presentation. What are you going to do when this breaks again in iOS 6.3?
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    3. CO@Ade: This document mentions that it is possible to chain modal view controllers: http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/ModalViewControllers/ModalViewControllers.html#//apple_ref/doc/uid/TP40007457-CH111-SW1
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