setNavigationBarHidden动画在iPhone X上无法正常工作

问题描述

我有一些代码可以通过隐藏UINavigationController的导航栏进入全屏模式。进入全屏模式时，我希望获得平滑的动画缩放效果。我使用

解决方案

在您的情况下，您同时使用 barTintColor & navigationBarStyle 和 Show Hide 动画。
barTintColor会覆盖样式属性所隐含的值
您应该选择 barTintColor 或 navigationBarStyle
在下面的代码中，我刚刚使用了 barTintColor &默认值为navigationBarStyle，它带有 Transulent 。

  var fullScreen = false {
 didSet {
 self.setNeedsStatusBarAppearanceUpdate（）
} 
} 
覆写func viewDidLoad（）{
 super.viewDidLoad（）
 title = Navigation Bar 
 navigationController？.navigationBar.barTintColor = .red 
} 
覆盖func viewWillAppear（_动画：Bool）{
 super.viewWillAppear（true）
 setFullScreen（on：fullScreen，animated：animation）
} 
 @IBAction func onToggleNavBarVisibility（_发送方：任意）{
，如果让navBarHidden = 
 self.navigationController？.isNavigationBarHidden {
 //切换状态
 fullScreen =！navBarHidden 
 setFullScreen（on：fullScreen，animation：true）
} 
} 
 private func setFullScreen（on：Bool，animated：Bool）{
 self.navigationController？.setNavigationBarHidden（在动画上：动画）
 self.setNeedsStatusBarAppearanceUpdate（）
} 
  

编辑：
如果您想隐藏状态栏-
，请使用 prefersStatusBarHidden 和bool值。 &使用 setNeedsStatusBarAppearanceUpdate

 覆盖var preferredsStatusBarHidden：Bool {
 return全屏
} 
  

I have code that enters full screen mode by hiding the UINavigationController's navigation bar. I want a smooth animated zooming effect when entering full screen. I use setNavigationBarHidden(_:animated:). This has all worked fine up to now, even on iOS 11, but on iPhone X the animation is not working well. On hiding, there is no animation and the nav bar just disappears. On unhiding, it does animate but the nav bar appears at a slower rate than the navigation controller's content area reduces, so an ugly black background shows through the navigation bar area during the animation.

I can recreate this in a simple test app. I have a UIViewController embedded in a UINavigationController.

Storyboard

• UINavigationController Navigation Bar: Style == Black; Translucent OFF
• UIViewController: Extend Edges: all options OFF.

I have tried all the combinations of Adjust Scroll View Insets and Extend Edges that I can think of but they made no difference.

Code

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    setFullScreen(on: fullScreen, animated: animated)
}

override var prefersStatusBarHidden: Bool
{
    return fullScreen
}

override var preferredStatusBarStyle: UIStatusBarStyle
{
    return .lightContent
}

@IBAction func onToggleNavBarVisibility(_ sender: Any) {

    if let navBarHidden = self.navigationController?.isNavigationBarHidden {
        // Toggle the state
        fullScreen = !navBarHidden

        setFullScreen(on: fullScreen, animated: true)
    }
}

private func setFullScreen(on : Bool, animated : Bool) {

    self.navigationController?.setNavigationBarHidden(on, animated: animated)
    self.setNeedsStatusBarAppearanceUpdate()
}

解决方案

In your case you are using both barTintColor & navigationBarStyle with Show Hide animation.barTintColor overrides the value implied by the Style attributeYou should select either barTintColor or navigationBarStyleIn below code i have just used barTintColor & navigationBarStyle is default with Transulent.

    var fullScreen = false{
      didSet{
        self.setNeedsStatusBarAppearanceUpdate()
     }
   }
    override func viewDidLoad() {
        super.viewDidLoad()
        title = "Navigation Bar"
        navigationController?.navigationBar.barTintColor = .red
    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(true)
        setFullScreen(on: fullScreen, animated: animated)
    }
    @IBAction func onToggleNavBarVisibility(_ sender: Any) {
        if let navBarHidden =
          self.navigationController?.isNavigationBarHidden {
            // Toggle the state
            fullScreen = !navBarHidden
            setFullScreen(on: fullScreen, animated: true)
        }
    }
    private func setFullScreen(on : Bool, animated : Bool) {
        self.navigationController?.setNavigationBarHidden(on, animated: animated)
        self.setNeedsStatusBarAppearanceUpdate()
    }

EDIT:If you want to hide status bar-use prefersStatusBarHidden with the bool value. & use setNeedsStatusBarAppearanceUpdate

   override var prefersStatusBarHidden: Bool {
        return fullScreen
    }

https://developer.apple.com/documentation/uikit/uinavigationbar

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