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POViewWillAppear not getting called with UISplitViewController
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copied!<p>Background & Objective: I have a UISplitViewController based iPad app - till now it supported 4 orientations but now I want to lock it down to only landscape. I changed <code>shouldAutorotateToInterfaceOrientation</code> of the left view controller to support only landscape mode, but this stops its <code>viewWillAppear</code> from getting called.</p> <p>Details: My iPad's view controllers are organized as below:</p> <pre><code>window `-- splitVC (UISplitViewController) `-- rootNav (UINavigationController) `-- hvc (HostManagerViewController, derived from UIViewController) `-- detailViewController (DetailViewController, derived from UIViewController) </code></pre> <p>This is implemented in the App Delegate as below:</p> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { HostManagerViewController *hvc = [[[HostManagerViewController alloc] initWithNibName:nil bundle:nil] autorelease]; self.detailViewController = [[[DetailViewController alloc] initWithNibName:nil bundle:nil] autorelease]; UINavigationController *rootNav = [[[UINavigationController alloc] initWithRootViewController:hvc] autorelease]; UISplitViewController *splitVC= [[[UISplitViewController alloc] init] autorelease]; [splitVC setViewControllers:[NSArray arrayWithObjects:rootNav, detailViewController, nil]]; splitVC.delegate = detailViewController; [window addSubview:splitVC.view]; [window setRootViewController:splitVC]; return YES; } </code></pre> <p><code>viewWillAppear</code> gets called when both <code>DetailViewController.m</code> and <code>HostManagerViewController.m</code> contain</p> <pre><code>- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } Console output: Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 3 Hostmanager: Viewdidload Should rotate called to hostmanager with 1 Hostmanager: viewwillappear </code></pre> <p>But when I change <code>HostManagerViewController</code>'s code to</p> <pre><code>- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (UIInterfaceOrientationIsLandscape(interfaceOrientation)); } </code></pre> <p>then 'viewWillAppear` of HostManagerViewController is not invoked. Console output</p> <pre><code>Should rotate called to hostmanager with 1 (1 is the numeric value of interfaceOrientation) Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 3 Should rotate called to hostmanager with 3 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 3 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 3 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 1 Should rotate called to hostmanager with 3 Hostmanager: Viewdidload Should rotate called to hostmanager with 1 </code></pre> <p>Only Landscape modes are supported in the Info.plist</p> <p>EDIT: Inserted NSLog messages to track <code>shouldAutorotateToInterfaceOrientation</code>, <code>viewWillAppear</code> and <code>ViewDidLoad</code></p>

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