FLEX/Example/UICatalog/AAPLMasterViewController.m

/*
        File: AAPLMasterViewController.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 AAPLSplitViewControllerDelegate for more information.
     Version: 2.12
    
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*/

#import "AAPLMasterViewController.h"

#if DEBUG
// FLEX should only be compiled and used in debug builds.
#import "FLEXManager.h"
#endif

@implementation AAPLMasterViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
#if DEBUG
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"FLEX" style:UIBarButtonItemStylePlain target:self action:@selector(flexButtonTapped:)];
#endif
}

- (void)flexButtonTapped:(id)sender
{
#if DEBUG
    [[FLEXManager sharedManager] showExplorer];
#endif
}

// When a segue from the AAPLMasterViewController's table view is triggered, we want to ensure that the current detail view controller's
// "More" bar button item is correctly transferred to the destination detail view controller's navigation item. We are only concerned about
// this change when the application is in portrait mode since this is the only time that the "More" bar button item will be visible.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    if (UIInterfaceOrientationIsPortrait(self.interfaceOrientation)) {
#pragma clang diagnostic pop
        UINavigationController *newDetailViewController = [segue destinationViewController];
        UINavigationController *oldDetailViewController = [self.splitViewController.viewControllers lastObject];
        
        // In order for a segue to occur when the view controller is in portrait, the "More" bar button item must be visible.
        // However, the "More" bar button item is only visible if the detail view controller's root view controller is
        // visible (otherwise there would be a "Back" bar button item). We can then query the old detail view controller's top view
        // controller for the current "More" bar button item.
        UIBarButtonItem *currentDetailBarButtonItem = oldDetailViewController.topViewController.navigationItem.leftBarButtonItem;

        // The new detail view controller's root view controller will be the top view controller when it's initially
        // pushed onto the detail navigation controller.
        newDetailViewController.topViewController.navigationItem.leftBarButtonItem = currentDetailBarButtonItem;
    }
}

@end