NavBar 与 iOS 13 Swift 中的状态栏重叠

Question

In some devices as iPhone 7 and 8 the navigation bar overlaps status bar after do navigating, the parent view controller has status bar hidden but I show and hide it in viewWillAppear and viewWillDisappear respectively. I tested in iOS 12 and it works.

I am using prefersStatusBarHidden to hidden the status bar.

Here the Image Navbar Overlaps Status bar

Update: Here an example project: https://github.com/FranklinSamboni/NavBarTestSwfit . It work fine in iOS 12 but with iOS 13 the navigation bar overlaps status bar in iPhone 7,8

Images with iPhone 8 (simulator) Home The second view Second View

Answer 1

Okay, I'm going to give one of those wishy-washy answers.

• On the one hand, you've definitely found a new behavior in iOS 13. When you hide the status bar, the navigation bar shrinks. You could term this a bug in iOS 13...

• On the other hand, it could be argued that what you are doing is wrong. If you have a navigation bar, you already cannot hide the status bar on a device without a bezel (iPhone X etc.), and now Apple seems to be assuming that if you have a navigation bar you won't hide the status bar at all . And that is a reasonable assumption, because it makes no sense to hide the status bar in portrait when there is a navigation bar, and especially in some children of the navigation controller but not others.

So you could file a bug report on this, but I don't think you'll get any joy from it. Apple is likely to reply that this is intended, or is at least a consequence of doing something they don't want to support. You have a navigation bar; allow the status bar to show.

Answer 2

I faced the same problem, after a few hours research, I found a not perfect but worked solution. Hope it will work for you.The code was written with Objective-C.

In viewDidAppear method of the secondViewController, hide statusBar first and show it at once.

1. Declare a member variable BOOL statusBarHidden in secondViewController
2. Implement prefersStatusBarHidden method from UIViewController

    - (BOOL)prefersStatusBarHidden { return statusBarHidden; }

3. Create a new method setStatusBarHidden

    - (void)setStatusBarHidden:(BOOL)hidden { if (statusBarHidden;= hidden) { statusBarHidden = hidden; [self setNeedsStatusBarAppearanceUpdate]; } }

4. Call setStatusBarHidden in viewDidAppear

    - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; [self setStatusBarHidden:YES]; [self setStatusBarHidden:NO]; }

Answer 3

You were always doing this wrong. Use two view controller classes. Get rid of your navigation controller override. This is all it takes:

class ViewController: UIViewController {

    override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation{
        return .fade
    }

    override var prefersStatusBarHidden: Bool { return true }
}

class ViewController2: UIViewController {

    override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation{
        return .fade
    }

    override var prefersStatusBarHidden: Bool { return false }

}

Or whatever your preference is. In other words, just let each view controller dictate its own status bar preference, and the navigation controller obeys automatically.