How to add UIView over navigation bar?

问题:

I need overlay UINavigationBar with UIView like here

Is there a way to do this except using custom UIView with button back as nav bar?

回答1:

You can add a subview to the base view of the Application

[[[UIApplication sharedApplication] keyWindow] addSubview:vMyCustomUIView];

To make sure it is only shown when your view controller is visible you could add and remove it in the viewDidAppear and viewDidDisappear delegate methods. Here is an example that would show a blue box overlapping them.

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.    
    vTestView = [[UIView alloc] initWithFrame:CGRectMake(10.0f,
                                                         10.0f,
                                                        100.0f,
                                                        100.0f)];
    vTestView.backgroundColor = [UIColor blueColor];
}


-(void)viewDidAppear:(BOOL)animated
{
    [[[UIApplication sharedApplication] keyWindow] addSubview:vMyCustomUIView];
}
-(void)viewDidDisappear:(BOOL)animated
{
    [vMyCustomUIView removeFromSuperview];
}

回答2:

Use the method :

- (void)bringSubviewToFront:(UIView *)view

So in your case that will be :

[navigationBar addSubview:myRibbon];
[navigationBar bringSubviewToFront:myRibbon];

Also don't forget that with this way, your ribbon won't be showed completely except if you do this :

navigationBar.clipsToBounds = NO;

回答3:

I hide NavigationBar and added UIView instead. It looks the same as Navbar. then add more one UIView with red bookmark. Beside it give possibility to animate bookmark on touch separately.

If I added bookmark this way: [navigationBar addSubview:myRibbon]; it was hidden on half of size

回答4:

Here's a Swift 3 answer

UIApplication.shared.keyWindow?.addSubview(menuView)

回答5:

Here's how implemented mine, hope this helps..

  override func viewWillAppear(_ animated: Bool) {
    let testView = UIView(frame: .zero)
    testView.backgroundColor = .black
    testView.layer.cornerRadius = 10
    testView.translatesAutoresizingMaskIntoConstraints = false
    self.navigationController?.navigationBar.addSubview(testView)
    NSLayoutConstraint.activate([
      testView.widthAnchor
        .constraint(equalToConstant: 50),
      testView.heightAnchor
        .constraint(equalToConstant: 70),
      testView.topAnchor
        .constraint(equalTo: (self.navigationController?.navigationBar.topAnchor)!),
      testView.trailingAnchor
        .constraint(equalTo: (self.navigationController?.navigationBar.trailingAnchor)!, constant: -20)
      ])
    self.customView = testView
  }

  // i dont need to display the overlay in every page
  // so i remove it everytime i navigate to a new page
  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    self.customView.removeFromSuperview()
  }