FLEX/Example/UICatalog/AAPLSplitViewControllerDelegate.m

/*
        File: AAPLSplitViewControllerDelegate.m
    Abstract: An iPad-only class that ensures that the root view controller of the application always has the bar button item displayed when in portrait. See AAPLMasterViewController for more information.
     Version: 2.12
    
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*/

#import "AAPLSplitViewControllerDelegate.h"

@implementation AAPLSplitViewControllerDelegate

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-implementations"

#pragma mark - UISplitViewControllerDelegate

// Implementing this delegate method allows us to present the detail view controller with the "More" bar button item.
- (void)splitViewController:(UISplitViewController *)splitViewController willHideViewController:(UIViewController *)viewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)popoverController {
    barButtonItem.title = NSLocalizedString(@"UICatalog", nil);

    UINavigationController *detailViewController = splitViewController.viewControllers.lastObject;

    // It's possible that the detail view controller has more than one view controller currently in its hierarchy. If this is the case, we
    // want to be sure that the root view controller of the navigation controller has its left bar button item set on its navigation item.
    // We don't want to override the navigation controller's top view controller's "Back" bar button item with the "More" bar button item.
    UIViewController *detailRootViewController = detailViewController.viewControllers.firstObject;

    [detailRootViewController.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
}

// This method is similar to the one above except that it removes the bar button on the detail view controller's root view controller
// since the interface orientation is now portrait.
- (void)splitViewController:(UISplitViewController *)splitViewController willShowViewController:(UIViewController *)viewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem {
    UINavigationController *detailViewController = splitViewController.viewControllers.lastObject;
    
    UIViewController *detailRootViewController = detailViewController.viewControllers.firstObject;

    [detailRootViewController.navigationItem setLeftBarButtonItem:nil animated:YES];
}

#pragma clang diagnostic pop

@end