blocks|key|243845|text|我的回答是基于this+post上的一些评论，这些评论都是猜测。我不确定这是否会起作用，因为苹果没有给我们任何直接的方式或代理方法，当导航栏隐藏。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|243846|将UINavigationBar子类设置为NavigationBar。将属性观察器添加到其hidden属性，如下所示：|style|CODE|243847|var+hidden:+Bool{
didSet{
++++UIApplication.sharedApplication().setStatusBarHidden(self.hidden,+animation:+.Slide)
}
}|code-block|syntax|javascript|243848|然后，您希望转到主视图控制器中的viewDidLoad方法，并将self.navigationBar属性(或self.navigationController.navigationBar，不确定是哪一个)设置为新NavigationBar类的实例。|243849|请注意，我现在不能测试它，请让我知道它是如何工作的。|243850|entityMap|0|LINK|mutability|MUTABLE|url|http://natashatherobot.com/navigation-bar-interactions-ios8/^0|7|9|0|0|19|6|0|0|G|B|W|I|1I|13|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@$A|13|B|14|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|16|8|@$A|17|B|18|F|G]|$A|19|B|1A|F|G]|$A|1B|B|1C|F|G]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

I am basing this answer on some comments on <a href="http://natashatherobot.com/navigation-bar-interactions-ios8/" rel="nofollow">this post</a>, which are speculation. I am not sure if this will work, because Apple does not give us any direct way or delegate method for when the navigation bar hides.

Subclass UINavigationBar as NavigationBar. Add a property observer to its <code>hidden</code> property like so:

<pre><code>var hidden: Bool{
didSet{
 UIApplication.sharedApplication().setStatusBarHidden(self.hidden, animation: .Slide)
}
}
</code></pre>

You want to then go to your <code>viewDidLoad</code> method in your main view controller, and set your <code>self.navigationBar</code> property (or <code>self.navigationController.navigationBar</code>, not sure which one) to an instance of your new NavigationBar class.

Note that I cannot test this right now, let me know how/if this works.

blocks|key|5186539|text|此问题已在Xcode+6.1中修复|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5186540|5186541|+navigationController?.navigationBar.hidden+=真|blockquote|5186542|5186543|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|J|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|K|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|L|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|M|8|@]|9|@]|A|$]]]|H|$]]

This is fixed problem for in Xcode 6.1

<blockquote>
 navigationController?.navigationBar.hidden = true
</blockquote>

blocks|key|245320|text|在UIViewController上覆盖以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|245321|extension+MyViewController+{
++override+func+prefersStatusBarHidden()+->+Bool+{
++++return+barsHidden+//+this+is+a+custom+property
++}

++//+Override+only+if+you+want+a+different+animation+than+the+default
++override+var+preferredStatusBarUpdateAnimation:+UIStatusBarAnimation+{
++++return+.slide
++}
}|code-block|syntax|javascript|245322|在代码中的某处更新barsHidden并调用setNeedsStatusBarAppearanceUpdate()|offset|length|style|CODE|245323|entityMap^0|0|0|9|A|M|Z|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

Override the following methods on UIViewController:

<pre><code>extension MyViewController {
 override func prefersStatusBarHidden() -&gt; Bool {
 return barsHidden // this is a custom property
 }

 // Override only if you want a different animation than the default
 override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation {
 return .slide
 }
}
</code></pre>

Update <code>barsHidden</code> somewhere in the code and call
<code>setNeedsStatusBarAppearanceUpdate()</code>

blocks|key|2151674|text|你可以通过使用UISwipeGestureRecognizer来检测滑动。我在UIWebView上使用它：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2151675|在viewDidLoad中，我有：|2151676|let+swipeUp+=+UISwipeGestureRecognizer(target:+self,+action:+"didSwipe")
let+swipeDown+=+UISwipeGestureRecognizer(target:+self,+action:+"didSwipe")
swipeUp.direction+=+UISwipeGestureRecognizerDirection.Up
swipeDown.direction+=+UISwipeGestureRecognizerDirection.Down
webView.addGestureRecognizer(swipeUp)
webView.addGestureRecognizer(swipeDown)
navigationController?.hidesBarsOnSwipe+=+true|code-block|syntax|javascript|2151677|我还有一个视图控制器的扩展，叫做WebViewViewController：|2151678|extension+WebViewViewController+{
++++override+func+prefersStatusBarHidden()+->+Bool+{
++++++++return+hideStatusBar
++++}

++++override+func+preferredStatusBarUpdateAnimation()+->+UIStatusBarAnimation+{
++++++++return+UIStatusBarAnimation.Slide
++++}
}|2151679|在我的WebViewViewController中的类级别上，我还有：|2151680|var+hideStatusBar+=+false

func+didSwipe()+{
++++hideStatusBar+=+true+++
}|2151681|entityMap^0|7|O|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|V|$]]

You could detect swipes by using <code>UISwipeGestureRecognizer</code>. I'm using it on UIWebView:

In viewDidLoad I have:

<pre><code>let swipeUp = UISwipeGestureRecognizer(target: self, action: "didSwipe")
let swipeDown = UISwipeGestureRecognizer(target: self, action: "didSwipe")
swipeUp.direction = UISwipeGestureRecognizerDirection.Up
swipeDown.direction = UISwipeGestureRecognizerDirection.Down
webView.addGestureRecognizer(swipeUp)
webView.addGestureRecognizer(swipeDown)
navigationController?.hidesBarsOnSwipe = true
</code></pre>

I also have an extension to my viewcontroller, called WebViewViewController:

<pre><code>extension WebViewViewController {
 override func prefersStatusBarHidden() -&gt; Bool {
 return hideStatusBar
 }

 override func preferredStatusBarUpdateAnimation() -&gt; UIStatusBarAnimation {
 return UIStatusBarAnimation.Slide
 }
}
</code></pre>

On a class level in my WebViewViewController I also have:

<pre><code>var hideStatusBar = false

func didSwipe() {
 hideStatusBar = true 
}
</code></pre>

blocks|key|3071545|text|好的，我花了一整天的时间来做这个，希望这能帮助一些人。有一个barHideOnSwipeGestureRecognizer。因此，您可以为相应的UIPanGesture创建一个侦听器，注意如果导航栏是隐藏的，那么它的y原点是-44.0；否则，它是0(不是20，因为我们隐藏了状态栏！)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3071546|在视图控制器中：|3071547|+//+Declare+at+beginning
var+curFramePosition:+Double!
var+showStatusBar:+Bool+=+true
self.navigationController?.barHideOnSwipeGestureRecognizer.addTarget(self,+action:+"didSwipe:")

...

override+func+viewDidLoad(){
++++self.navigationController?.hidesBarsOnSwipe+=+true
++curFramePosition+=+0.0+//+Not+hidden
++self.navigationController?.barHideOnSwipeGestureRecognizer.addTarget(self,+action:+"didSwipe:")
++...
}

func+didSwipe(swipe:+UIPanGestureRecognizer){
++++//+Visible+to+hidden
++++if+curFramePosition+==+0+&&+self.navigationController?.navigationBar.frame.origin.y+==+-44+{
++++++++curFramePosition+=+-44
++++++++showStatusBar+=+false
++++++++prefersStatusBarHidden()
++++++++setNeedsStatusBarAppearanceUpdate()
++++}
++++//+Hidden+to+visible
++++else+if+curFramePosition+==+-44+&&+self.navigationController?.navigationBar.frame.origin.y+==+0+{
++++++++curFramePosition+=+0
++++++++showStatusBar+=+true
++++++++prefersStatusBarHidden()
++++++++setNeedsStatusBarAppearanceUpdate()
++++}
}

override+func+prefersStatusBarHidden()+->+Bool+{
++++if+showStatusBar{
++++++++return+false
++++}
++++return+true
}|code-block|syntax|javascript|3071548|entityMap^0|U|V|20|C|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Okay I spent all day doing this, hopefully this helps some people out. There's a <code>barHideOnSwipeGestureRecognizer</code>. So you could make a listener for the corresponding <code>UIPanGesture</code>, noting that if the navigation bar is hidden then its y origin is -44.0; otherwise, it's 0 (not 20 because we hid the status bar!).

In your view controller:

<pre><code> // Declare at beginning
var curFramePosition: Double!
var showStatusBar: Bool = true
self.navigationController?.barHideOnSwipeGestureRecognizer.addTarget(self, action: "didSwipe:")

...

override func viewDidLoad(){
 self.navigationController?.hidesBarsOnSwipe = true
 curFramePosition = 0.0 // Not hidden
 self.navigationController?.barHideOnSwipeGestureRecognizer.addTarget(self, action: "didSwipe:")
 ...
}

func didSwipe(swipe: UIPanGestureRecognizer){
 // Visible to hidden
 if curFramePosition == 0 &amp;&amp; self.navigationController?.navigationBar.frame.origin.y == -44 {
 curFramePosition = -44
 showStatusBar = false
 prefersStatusBarHidden()
 setNeedsStatusBarAppearanceUpdate()
 }
 // Hidden to visible
 else if curFramePosition == -44 &amp;&amp; self.navigationController?.navigationBar.frame.origin.y == 0 {
 curFramePosition = 0
 showStatusBar = true
 prefersStatusBarHidden()
 setNeedsStatusBarAppearanceUpdate()
 }
}

override func prefersStatusBarHidden() -&gt; Bool {
 if showStatusBar{
 return false
 }
 return true
}
</code></pre>

iOS 8 adds a super new cool feature: hiding the navigation bar when user is scrolling.

This with a single line in <code>viewDidload</code> :

<pre><code>navigationController?.hidesBarsOnSwipe = true
</code></pre>

Cool, isn't it?

But now I have a little problem: when the navigation bar is hidden, the status bar is still here and overlaps content, which is ugly.

What should I do to make it hidden when the navigation bar is hidden?

Hide status bar while scrolling

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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iOS 8增加了一个超级新的酷功能:当用户滚动时隐藏导航栏。在viewDidload中只有一行：navigationController?.hidesBarsOnSwipe = true很酷，不是吗？但现在我有一个小问题:当导航栏被隐藏时，状态栏仍然在这里，并与内容重叠，这是丑陋的。当导航栏被隐藏时，我应该怎么做才能使...

问滚动时隐藏状态栏
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