blocks|key|1023103|text|首先阅读iOS的视图控制器编程指南中关于“为导航视图采用全屏布局”的部分，以及关于自定义视图的相同部分。如果您正在尝试执行类似于Photos.app的操作，那么您可能正在使用滚动视图。请注意，“导航栏”会自动将滚动内容添加到滚动视图中，以适应导航栏(和状态栏)的高度，因此您必须在设置navigationBar的初始状态之后、视图出现之前立即将滚动视图的contentInset属性重置回零(UIEdgeInsetsZero)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1023104|然后，如果您有一次点击切换navigationBar和/或状态栏以显示或隐藏，您需要在您的切换方法中做两件事。第一种方法似乎是在更改NavigationBar+hidden属性之前保存滚动视图的contentOffset属性，然后立即将保存的值恢复为contentOffset。然后，在更改navigationBarHidden属性后，再次将contentInset属性置零为UIEdgeInsetsZero。此外，如果要切换状态栏，则需要在更改导航栏的状态之前更改其状态。|1023105|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

First read the the section in the View Controller Programming Guide for iOS about 'Adopting a Full-Screen Layout for Navigation Views' and the section about the same for Custom Views. If you are trying to do something like the Photos.app then you are probably using a scroll view. Note the comment that Navigation bars automatically add a scroll content inset to your scroll view to account for the height of the navigation bar (and status bar) so you have to reset the contentInset property of your scroll view back to zero (UIEdgeInsetsZero) right after setting up the initial state of the navigationBar and before the view appears.

Then if you have a single tap that toggles the navigationBar and/or status bar to show or hide, you need to do two things in you toggling method. The first seems to be to save the scroll view's contentOffset property before changing the NavigationBar hidden property and restore your saved value to contentOffset right afterward. And second to again zero out the contentInset property to UIEdgeInsetsZero after changing the navigationBarHidden property. Also, if you are toggling the status bar, you need to change its state before you change the navigationBar's state.

blocks|key|1237850|text|此代码将对您有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237851|UITapGestureRecognizer+*tapGesture+=+[[UITapGestureRecognizer+alloc]+
initWithTarget:self+action:@selector(showHideNavbar:)];
[self.view+addGestureRecognizer:tapGesture];

-(void)+showHideNavbar:(id)+sender+
{+
//+write+code+to+show/hide+nav+bar+here+
//+check+if+the+Navigation+Bar+is+shown
if+(self.navigationController.navigationBar.hidden+==+NO)
{
//+hide+the+Navigation+Bar
[self.navigationController+setNavigationBarHidden:YES+animated:YES];
}
//+if+Navigation+Bar+is+already+hidden
else+if+(self.navigationController.navigationBar.hidden+==+YES)
{
//+Show+the+Navigation+Bar
[self.navigationController+setNavigationBarHidden:NO+animated:YES];
}
}|code-block|syntax|javascript|1237852|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This code will help you.

<pre><code>UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] 
initWithTarget:self action:@selector(showHideNavbar:)];
[self.view addGestureRecognizer:tapGesture];

-(void) showHideNavbar:(id) sender 
{ 
// write code to show/hide nav bar here 
// check if the Navigation Bar is shown
if (self.navigationController.navigationBar.hidden == NO)
{
// hide the Navigation Bar
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
// if Navigation Bar is already hidden
else if (self.navigationController.navigationBar.hidden == YES)
{
// Show the Navigation Bar
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
</code></pre>

blocks|key|1237908|text|要隐藏导航栏，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237909|[self.navigationController+setNavigationBarHidden:YES+animated:YES];|code-block|syntax|javascript|1237910|要显示导航栏：|1237911|[self.navigationController+setNavigationBarHidden:NO+animated:YES];|1237912|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To hide Navigation bar :

<pre><code>[self.navigationController setNavigationBarHidden:YES animated:YES];
</code></pre>

To show Navigation bar :

<pre><code>[self.navigationController setNavigationBarHidden:NO animated:YES];
</code></pre>

blocks|key|1238014|text|这里有一个非常快速而简单的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1238015|self.navigationController.hidesBarsOnTap+=+YES;|code-block|syntax|javascript|1238016|这将在单击时起作用，而不是双击。此外，它还将更改导航控制器的行为，即使在按下或弹出当前视图控制器之后也是如此。|1238017|如果您只想为单个视图控制器设置此行为，则始终可以在控制器的viewWillAppear:和viewWillDisappear:操作中修改此行为。|1238018|这是documentation|offset|length|1238019|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/documentation/UIKit/Reference/UINavigationController_Class/#//apple_ref/occ/instp/UINavigationController/hidesBarsOnTap^0|0|0|0|0|2|D|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Here is a very quick and simple solution:

<pre><code>self.navigationController.hidesBarsOnTap = YES;
</code></pre>

This will work on single tap instead of double tap. Also it will change the behavior for the navigation controller even after pushing or popping the current view controller. 

You can always modify this behavior in your controller within the viewWillAppear: and viewWillDisappear: actions if you would like to set the behavior only for a single view controller. 

Here is the <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UINavigationController_Class/#//apple_ref/occ/instp/UINavigationController/hidesBarsOnTap" rel="noreferrer">documentation</a>:

blocks|key|1023323|text|SWIFT代码:这完全适用于iOS+3.2和更高版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1023324|++override+func+viewDidAppear(animated:+Bool)+{
++++super.viewDidAppear(animated)

++++let+tapGesture+=+UITapGestureRecognizer(target:+self,+action:+"hideNavBarOntap")let+tapGesture+=+UITapGestureRecognizer(target:+self,+action:+"hideNavBarOntap")
++++tapGesture.delegate+=+self
++++self.view.addGestureRecognizer(tapGesture)|code-block|syntax|javascript|1023325|然后写下|1023326|func+hideNavBarOntap()+{
++++if(self.navigationController?.navigationBar.hidden+==+false)+{
++++++++self.navigationController?.setNavigationBarHidden(true,+animated:+true)+//+hide+nav+bar+is+not+hidden
++++}+else+if(self.navigationController?.navigationBar.hidden+==+true)+{
++++++++self.navigationController?.setNavigationBarHidden(false,+animated:+true)+//+show+nav+bar
++++}
}|1023327|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

SWIFT CODE: This works fully for iOS 3.2 and later. 

<pre><code> override func viewDidAppear(animated: Bool) {
 super.viewDidAppear(animated)

 let tapGesture = UITapGestureRecognizer(target: self, action: "hideNavBarOntap")let tapGesture = UITapGestureRecognizer(target: self, action: "hideNavBarOntap")
 tapGesture.delegate = self
 self.view.addGestureRecognizer(tapGesture)
</code></pre>

then write

<pre><code>func hideNavBarOntap() {
 if(self.navigationController?.navigationBar.hidden == false) {
 self.navigationController?.setNavigationBarHidden(true, animated: true) // hide nav bar is not hidden
 } else if(self.navigationController?.navigationBar.hidden == true) {
 self.navigationController?.setNavigationBarHidden(false, animated: true) // show nav bar
 }
}
</code></pre>

blocks|key|1023418|text|一种方法是取消选中Attribute+Inspector.Hope+this+help+One中的栏可见性“显示导航栏”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1023419|​|1023420|📷|atomic|offset|length|1023421|1023422|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/38861d13ab98c2e0dea88033fe1ebcfb.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

One way could be by unchecking Bar Visibility "Shows Navigation Bar" In Attribute Inspector.Hope this help someone.

<a href="https://i.stack.imgur.com/MV4Zu.png" rel="noreferrer"><img src="https://i.stack.imgur.com/MV4Zu.png" alt="enter image description here"></a>

blocks|key|1238186|text|UINavigationController属性上的hidesBarsOnTap出来用iOS8+SDK来处理这个问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1238187|https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UINavigationController_Class/#//apple_ref/occ/instp/UINavigationController/hidesBarsOnTap|1238188|entityMap|0|LINK|mutability|MUTABLE|url^0|Q|E|0|0|4Q|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@$9|S|A|T|1|U]]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|G]]]]

<code>hidesBarsOnTap</code> on UINavigationController property come out to handle just this with iOS8 SDK

<a href="https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UINavigationController_Class/#//apple_ref/occ/instp/UINavigationController/hidesBarsOnTap" rel="nofollow">https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UINavigationController_Class/#//apple_ref/occ/instp/UINavigationController/hidesBarsOnTap</a>

blocks|key|1238202|text|在Swift+4.2和Xcode+10中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1238203|self.navigationController?.isNavigationBarHidden+=+true++//Hide
self.navigationController?.isNavigationBarHidden+=+false++//Show|code-block|syntax|javascript|1238204|如果您不想只在第一个VC中显示导航栏，但又希望在onword的第二个VC中显示|1238205|在你的第一个VC中写下这段代码。|1238206|override+func+viewWillAppear(_+animated:+Bool)+{
++++self.navigationController?.isNavigationBarHidden+=+true++//Hide
}

override+func+viewWillDisappear(_+animated:+Bool)+{
++++self.navigationController?.isNavigationBarHidden+=+false++//Show
}|1238207|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In Swift 4.2 and Xcode 10

<pre><code>self.navigationController?.isNavigationBarHidden = true //Hide
self.navigationController?.isNavigationBarHidden = false //Show
</code></pre>

If you don't want to display Navigation bar only in 1st VC, but you want display in 2nd VC onword's

In your 1st VC write this code.

<pre><code>override func viewWillAppear(_ animated: Bool) {
 self.navigationController?.isNavigationBarHidden = true //Hide
}

override func viewWillDisappear(_ animated: Bool) {
 self.navigationController?.isNavigationBarHidden = false //Show
}
</code></pre>

I have an app with a navigation bar consisting of 2 bar buttons. I would like to hide and show this navigation bar when a user double taps the screen.

Initially, the navigation bar should be hidden. When a user double taps the screen, the navigation bar should come up with an animation, like what can be seen in the iPhone's photo gallery.

How can i do something this? Suggestions are always appreciated.

Navigation bar show/hide 

我有一个应用程序与导航栏由2个栏按钮组成。当用户双击屏幕时，我想隐藏和显示此导航栏。最初，导航栏应该是隐藏的。当用户双击屏幕时，导航栏应该会弹出一个动画，就像在iPhone的照片库中看到的那样。我怎么能做到这一点呢？建议总是很受欢迎的。

问导航栏显示/隐藏
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