How to avoid the Black box appeared when hidden the navigationbar?

Question

I have a app with main page is a hidden navigationbar ,and when I back from child page with navigationbar to this main page ,because I set the navigation hidden in the main page method: - (void)viewWillAppear, I　found that a black box will appear with animation, how to avoid it? Thank you very much!!!

Answer 1

Ok , I find the answer:

self.navigationController.view.backgroundColor = [UIColor redColor];

Answer 2

This fixes the problem without hacking the colour, which could lead to navigation controllers being the wrong colour.

Just set it to be animated in viewWillAppear :)

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:YES];
    [self.navigationController setNavigationBarHidden:YES animated:YES];
}

and if you go back to page with nav controller set Animation to NO

- (IBAction)backButtonClicked:(id)sender {
    [self.navigationController setNavigationBarHidden:NO animated:NO];
    [self.navigationController popToRootViewControllerAnimated:YES];
}

Answer 3

May be this will help someone if its happening in a tabbar controller app while switching between tabs

override func viewWillAppear(_ animated: Bool) {
            super.viewWillAppear(animated)
            self.navigationController?.setNavigationBarHidden(true, animated: true)
        }

override func viewWillDisappear(_ animated: Bool) {
            super.viewWillDisappear(animated)
            if self.navigationController?.visibleViewController != self {
                self.navigationController?.setNavigationBarHidden(false, animated: true)
            }
        }

Answer 4

For Swift3.0

In First ViewController

override func viewWillAppear(_ animated: Bool) {
     super.viewWillAppear(true)
     self.navigationController?.setNavigationBarHidden(true, animated: true)
    }

In Second ViewController

func backButtonPressed() {
        self.navigationController?.setNavigationBarHidden(false, animated: false)
        self.navigationController?.popViewController(animated: true)
    } 

Answer 5

Call layoutSubviews() after your call to hide or show the navigation bar:

[self.navigationController.view layoutSubviews];