Unwanted double navigation bar

问题

I made the navigation bar (top bar) appear/disappear when I tap the screen, and also lay on top of the background image. It worked, but with one problem: I've suddenly got two navigation bars! First, one with a back button named "Back", and when I press "Back" it pops up a new navigation bar with a back button named "Vinene", which is the title of the TableView it leads back to. Thats the one I want to keep. I think the issue is somewhere in the DetailViewController.m or in the didselectrowatindexpath in the MasterViewController.m. Hope someone can see the problem!

DetailViewController.m:

@interface WinesDetailViewController ()

@end

@implementation WinesDetailViewController

@synthesize wineDictionary;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];

}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.

self.navigationController.navigationBar.translucent = YES;
                         self.wantsFullScreenLayout = YES;

UITapGestureRecognizer *tap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideShowNavigation)] autorelease];
                                                                                                         tap.numberOfTapsRequired = 1;
                                                                                                 [self.view addGestureRecognizer:tap];
}

- (void) hideShowNavigation
{
[self.navigationController setNavigationBarHidden:!self.navigationController.navigationBarHidden];
}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (BOOL)hidesBottomBarWhenPushed{
return TRUE;
}


@end

MasterViewController.m:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{
    {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];    

    NSDictionary *dictionary = [wine libraryItemAtIndex:indexPath.row];

    if (winesDetailViewController == nil) {
        // Init the wine detail view
        winesDetailViewController = [[WinesDetailViewController alloc] init];
    }
    // Here you pass the dictionary
    winesDetailViewController.wineDictionary = dictionary;

    [self.navigationController pushViewController:winesDetailViewController animated:YES];
    }
}

回答1:

Usually, a recurring navigation bar like you describe is caused by something like pushing the same view controller twice. Can you check to ensure you're only pushing a single view controller on to your navigation stack (via breakpoints or logging?). Is it possible that winesDetailViewController is already on the navigation stack? You can also try logging the value of self.navigationController.viewControllers for a hint.

I would also suggest moving

self.navigationController.navigationBar.translucent = YES;

to viewWillAppear and

self.wantsFullScreenLayout = YES;

to your initializer (though I don't think this will solve your problem).

来源：https://stackoverflow.com/questions/11199227/unwanted-double-navigation-bar

标签

iphone

xcode

uinavigationcontroller

uinavigationbar