blocks|key|2925666|text|您可以从接口构建器中执行此操作，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2925667|单击上一个视图控制器的导航项|2925668|​|2925669|📷|atomic|offset|length|2925670|2925671|从属性检查器中，将后退按钮文本设置为所需内容。就是这样！！|style|BOLD|2925672|2925673|2925674|2925675|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/1c2a598731e7301e11d03c32e3ac47b1.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/bebcdd42f7e3d9ce6afaba1b8d4afe07.png^0|0|0|0|0|1|0|0|0|N|6|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|16|8|@]|9|@$I|17|J|18|1|19]]|A|$]]|$1|K|3|E|5|6|7|1A|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1B|8|@$I|1C|J|1D|N|O]]|9|@]|A|$]]|$1|P|3|E|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|G|5|H|7|1F|8|@]|9|@$I|1G|J|1H|1|1I]]|A|$]]|$1|R|3|E|5|6|7|1J|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]|11|$5|V|W|X|A|$Y|12|10|-4]]]]

You can do it from interface builder as follows:

click on the navigation item of previous view controller

<a href="https://i.stack.imgur.com/SShW1.png"><img src="https://i.stack.imgur.com/SShW1.png" alt="enter image description here"></a>

from the attributes inspector set the back button text to whatever you want. Thats it!!

<a href="https://i.stack.imgur.com/e84Ak.png"><img src="https://i.stack.imgur.com/e84Ak.png" alt="enter image description here"></a>

blocks|key|2925973|text|您可以将这3行代码放入您想要更改back按钮标题的+ViewController中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|2925974|在你的override+func+viewDidLoad()+{}里。|2925975|let+backButton+=+UIBarButtonItem()
backButton.title+=+"My+Back+Button+Title"
self.navigationController?.navigationBar.topItem?.backBarButtonItem+=+backButton|code-block|syntax|javascript|2925976|entityMap^0|9|G|Q|E|Q|E|0|3|U|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|W|8|@$9|X|A|Y|B|D]]|E|@]|F|$]]|$1|I|3|J|5|K|7|Z|8|@]|E|@]|F|$L|M]]|$1|N|3|-4|5|6|7|10|8|@]|E|@]|F|$]]]|O|$]]

You can put this 3 line of code in the <code>ViewController</code> you want to change the back button title.

In your <code>override func viewDidLoad() {}</code>.

<pre><code>let backButton = UIBarButtonItem()
backButton.title = "My Back Button Title"
self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton
</code></pre>

blocks|key|2925709|text|Back-button文本取自父视图控制器的导航项目标题。因此，无论您在上一个视图控制器的导航项标题上设置什么，都将显示在当前视图控制器的后退按钮文本上。您可以将"“作为导航项目标题放在父视图控制器的viewWillAppear方法中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2925710|self.navigationItem.title+=+""|code-block|syntax|javascript|2925711|另一种方式是把|2925712|self.navigationController?.navigationBar.topItem?.title+=+""|2925713|在当前视图控制器的viewWillAppear方法中。如果导航堆栈太过嵌套，这个问题会导致一些其他问题。|2925714|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Back-button text is taken from parent view-controller's navigation item title. So whatever you set on previous view-controller's navigation item title, will be shown on current view controller's back button text. 
You can just put "" as navigation item title in parent view-controller's viewWillAppear method.

<pre><code>self.navigationItem.title = ""
</code></pre>

Another way is to put 

<pre><code>self.navigationController?.navigationBar.topItem?.title = ""
</code></pre>

in current view controller's viewWillAppear method. This one will cause some other problem if navigation stack is too nested.

blocks|key|141642|text|如果您使用xib文件作为视图控制器，那么在您的视图控制器类中执行此操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|141643|class+AboutUsViewController:+UIViewController+{

override+func+viewDidLoad()+{
++++super.viewDidLoad()
++++edgesForExtendedLayout+=+[]
++++setUpNavBar()
}

func+setUpNavBar(){
++++//For+title+in+navigation+bar
++++self.navigationController?.view.backgroundColor+=+UIColor.white
++++self.navigationController?.view.tintColor+=+UIColor.orange
++++self.navigationItem.title+=+"About+Us"

++++//For+back+button+in+navigation+bar
++++let+backButton+=+UIBarButtonItem()
++++backButton.title+=+"Back"
++++self.navigationController?.navigationBar.topItem?.backBarButtonItem+=+backButton
}

}|code-block|syntax|javascript|141644|结果将是：|141645|​|141646|📷|atomic|offset|length|141647|141648|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/20a4bea257e65c974f4657da73db2729.png|imageAlt^0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|13|8|@]|9|@$N|14|O|15|1|16]]|A|$]]|$1|P|3|J|5|6|7|17|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X|Y|-4]]]]

If you are using xib file for view controller then do this in your view controller class.

<pre><code>class AboutUsViewController: UIViewController {

override func viewDidLoad() {
 super.viewDidLoad()
 edgesForExtendedLayout = []
 setUpNavBar()
}

func setUpNavBar(){
 //For title in navigation bar
 self.navigationController?.view.backgroundColor = UIColor.white
 self.navigationController?.view.tintColor = UIColor.orange
 self.navigationItem.title = "About Us"

 //For back button in navigation bar
 let backButton = UIBarButtonItem()
 backButton.title = "Back"
 self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton
}

}
</code></pre>

The result will be:

<a href="https://i.stack.imgur.com/U4TH6.png" rel="noreferrer"><img src="https://i.stack.imgur.com/U4TH6.png" alt="enter image description here"></a>

blocks|key|139144|text|我不知道您在哪里使用了您在问题中提出的方法，但如果我在我的ViewController类(其中我想要更改后退按钮)上，在viewDidLoad()函数上使用以下行，我可以得到所需的结果：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|139145|self.navigationController?.navigationBar.backItem?.title+=+"Anything+Else"|code-block|syntax|javascript|139146|结果将是：|139147|之前的|139148|​|BOLD|139149|📷|atomic|139150|139151|之后的|139152|139153|139154|139155|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/27e35f6d3790eb3d3bf2f9307cc908fa.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/f4441e7a130ce9a8eb06b2ea0e66e682.png^0|T|E|1O|D|0|0|0|0|0|1|0|0|1|0|1|0|0|0|1|0|0|0|1|0|0|1|0|1|1|0|0|1|0^^$0|@$1|2|3|4|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1G|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1H|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1I|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1J|8|@$9|1K|A|1L|B|Q]]|D|@]|E|$]]|$1|R|3|S|5|T|7|1M|8|@$9|1N|A|1O|B|Q]]|D|@$9|1P|A|1Q|1|1R]]|E|$]]|$1|U|3|P|5|6|7|1S|8|@$9|1T|A|1U|B|Q]]|D|@]|E|$]]|$1|V|3|W|5|6|7|1V|8|@]|D|@]|E|$]]|$1|X|3|P|5|6|7|1W|8|@$9|1X|A|1Y|B|Q]]|D|@]|E|$]]|$1|Y|3|S|5|T|7|1Z|8|@$9|20|A|21|B|Q]]|D|@$9|22|A|23|1|24]]|E|$]]|$1|Z|3|P|5|6|7|25|8|@$9|26|A|27|B|Q]]|D|@]|E|$]]|$1|10|3|-4|5|6|7|28|8|@]|D|@]|E|$]]]|11|$12|$5|13|14|15|E|$16|17|18|-4]]|19|$5|13|14|15|E|$16|1A|18|-4]]]]

I do not know where you have used your methods that you put on your question but I could get the desired result if I use, on my <code>ViewController</code> class (in which I want to change the back button), on <code>viewDidLoad()</code> function, the following line:

<pre><code>self.navigationController?.navigationBar.backItem?.title = "Anything Else"
</code></pre>

The result will be:

Before

<a href="https://i.stack.imgur.com/cO71F.png"><img src="https://i.stack.imgur.com/cO71F.png" alt="enter image description here"></a>

After

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

blocks|key|140370|text|back按钮属于上一个视图控制器，而不是当前显示在屏幕上的那个。要修改后退按钮，你应该在按下之前更新它，添加viewdidload：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|140371|Swift+4：|140372|self.navigationItem.backBarButtonItem+=+UIBarButtonItem(title:+"",+style:+.plain,+target:+self,+action:+nil)|code-block|syntax|javascript|140373|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The back button belongs to the previous view controller, not the one currently presented on screen.
To modify the back button you should update it before pushing, add viewdidload :

Swift 4:

<pre><code>self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: self, action: nil)
</code></pre>

blocks|key|140566|text|您可以只修改情节提要中的NavigationItem|type|unstyled|depth|inlineStyleRanges|entityRanges|data|140567|​|140568|📷|atomic|offset|length|140569|140570|在Back按钮中添加一个空格，然后按Enter键。|140571|140572|注意:在以前的VC中执行此操作。|blockquote|140573|140574|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e26f5e3dcc1aee7e524db767acc691e5.png|imageAlt^0|0|0|0|1|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@$G|12|H|13|1|14]]|A|$]]|$1|I|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|18|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X|Y|-4]]]]

You can just modify the NavigationItem in the storyboard

<a href="https://i.stack.imgur.com/sML47.png" rel="noreferrer"><img src="https://i.stack.imgur.com/sML47.png" alt="enter image description here"></a>

In the Back Button add a space and press Enter.

<blockquote>
 Note: Do this in the previous VC.
</blockquote>

blocks|key|2925595|text|这应该是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2925596|override+func+viewDidLoad()+{
++++super.viewDidLoad()

++++var+button+=+UIBarButtonItem(title:+"YourTitle",+style:+UIBarButtonItemStyle.Bordered,+target:+self,+action:+"goBack")
++++self.navigationItem.backBarButtonItem+=+button

}

func+goBack()
{
++++self.navigationController?.popViewControllerAnimated(true)
}|code-block|syntax|javascript|2925597|尽管不推荐这样做，因为这实际上取代了backButton，而且还删除了向后箭头和滑动手势。|2925598|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This should work:

<pre><code>override func viewDidLoad() {
 super.viewDidLoad()

 var button = UIBarButtonItem(title: "YourTitle", style: UIBarButtonItemStyle.Bordered, target: self, action: "goBack")
 self.navigationItem.backBarButtonItem = button

}

func goBack()
{
 self.navigationController?.popViewControllerAnimated(true)
}
</code></pre>

Although it is not recommended since this actually replaces the backButton and it also removed the back arrow and the swipe gesture.

blocks|key|140609|text|Swift+4.2|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|140610|如果要更改导航栏的后退按钮项文本，请将其放在显示后退按钮的位置之前的控制器的viewDidLoad中，而不是放在后退按钮可见的视图控制器上。|CODE|140611|+let+backButton+=+UIBarButtonItem()
+backButton.title+=+"New+Back+Button+Text"
+self.navigationController?.navigationBar.topItem?.backBarButtonItem+=+backButton|code-block|syntax|javascript|140612|如果您想要更改当前导航栏标题文本，请使用下面的代码(请注意，这将成为推送到导航控制器上的下一个视图的默认背景文本，但此默认背景文本可以被上面的代码覆盖)|140613|+self.title+=+"Navigation+Bar+Title"|140614|entityMap^0|0|9|0|12|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|H]]|D|@]|E|$]]|$1|I|3|J|5|K|7|Z|8|@]|D|@]|E|$L|M]]|$1|N|3|O|5|6|7|10|8|@]|D|@]|E|$]]|$1|P|3|Q|5|K|7|11|8|@]|D|@]|E|$L|M]]|$1|R|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|S|$]]

Swift 4.2

If you want to change the navigation bar back button item text, put this in <code>viewDidLoad</code> of the controller BEFORE the one where the back button shows, NOT on the view controller where the back button is visible.

<pre><code> let backButton = UIBarButtonItem()
 backButton.title = "New Back Button Text"
 self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton
</code></pre>

If you want to change the current navigation bar title text use the code below (note that this becomes the default back text for the NEXT view pushed onto the navigation controller, but this default back text can be overridden by the code above)

<pre><code> self.title = "Navigation Bar Title"
</code></pre>

blocks|key|2926316|text|Swift+4+-在按下任何视图控制器之前配置后退按钮|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2926317|//+if+you+want+to+remove+the+text
navigationItem.backBarButtonItem+=+UIBarButtonItem()

//+if+you+want+to+modify+the+text+to+"back"
navigationItem.backBarButtonItem+=+UIBarButtonItem(title:+"back",+style:+.plain,+target:+nil,+action:+nil)|code-block|syntax|javascript|2926318|entityMap^0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Swift 4 - Configure the back button before pushing any view controllers

<pre><code>// if you want to remove the text
navigationItem.backBarButtonItem = UIBarButtonItem()

// if you want to modify the text to "back"
navigationItem.backBarButtonItem = UIBarButtonItem(title: "back", style: .plain, target: nil, action: nil)
</code></pre>

blocks|key|142889|text|有两种方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|142890|1.在previousViewController.viewDidLoad()|142891|let+backBarBtnItem+=+UIBarButtonItem()
backBarBtnItem.title+=+"back"
navigationItem.backBarButtonItem+=+backBarBtnItem|code-block|syntax|javascript|142892|2.在currentViewController.viewDidAppear()|142893|let+backBarBtnItem+=+UIBarButtonItem()
backBarBtnItem.title+=+"back"++++++
navigationController?.navigationBar.backItem?.backBarButtonItem+=+backBarBtnItem|142894|原因：backButton来自navigationBar.backItem.backBarButtonItem，所以第一种方法是obvious.In+currentViewController.viewDidLoad()，我们无法获得backItem的引用，因为在viewDidAppear()中，navigationBar在其stack.so上推送navigationView，我们可以在currentViewController.viewDidAppear()中对backItem进行更改。|offset|length|style|CODE|142895|有关更多详细信息，请参阅Document:UINavigationBar|142896|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/uikit/uinavigationbar^0|0|0|0|0|0|3|A|F|14|39|8|45|D|4K|5|4V|E|6I|8|0|C|O|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|17|8|@$O|18|P|19|Q|R]|$O|1A|P|1B|Q|R]|$O|1C|P|1D|Q|R]|$O|1E|P|1F|Q|R]|$O|1G|P|1H|Q|R]|$O|1I|P|1J|Q|R]|$O|1K|P|1L|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1M|8|@]|9|@$O|1N|P|1O|1|1P]]|A|$]]|$1|U|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]]]

There are two ways.

1.In the previousViewController.viewDidLoad()

<pre class="lang-swift prettyprint-override"><code>let backBarBtnItem = UIBarButtonItem()
backBarBtnItem.title = "back"
navigationItem.backBarButtonItem = backBarBtnItem
</code></pre>

2.In the currentViewController.viewDidAppear()

<pre class="lang-swift prettyprint-override"><code>let backBarBtnItem = UIBarButtonItem()
backBarBtnItem.title = "back" 
navigationController?.navigationBar.backItem?.backBarButtonItem = backBarBtnItem
</code></pre>

Reason : the <code>backButton</code> comes from <code>navigationBar.backItem.backBarButtonItem</code>,so the first way is obvious.In currentViewController.viewDidLoad(),we can't obtain the reference of <code>backItem</code>,because in viewDidAppear(),the <code>navigationBar</code> pushed <code>navigationView</code> on its <code>stack</code>.so we can make changes to the <code>backItem</code> in currentViewController.viewDidAppear() 

For more details,you can see <a href="https://developer.apple.com/documentation/uikit/uinavigationbar" rel="noreferrer">Document:UINavigationBar</a>

blocks|key|2713313|text|在表示控制器的viewDidLoad方法中添加：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|2713314|//+hide+navigation+bar+title+in+the+next+controller
let+backButton+=+UIBarButtonItem(title:+"",+style:.Plain,+target:+nil,+action:+nil)
navigationItem.backBarButtonItem+=+backButton|code-block|syntax|javascript|2713315|entityMap^0|1|5|7|B|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|S|8|@]|E|@]|F|$J|K]]|$1|L|3|-4|5|6|7|T|8|@]|E|@]|F|$]]]|M|$]]

In the <code>viewDidLoad</code> method of the presenting controller add:

<pre><code>// hide navigation bar title in the next controller
let backButton = UIBarButtonItem(title: "", style:.Plain, target: nil, action: nil)
navigationItem.backBarButtonItem = backButton
</code></pre>

blocks|key|2713761|text|虽然这些答案解决了问题，但这可能是一些有用的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2713762|class+MainNavigatioController:+UINavigationController+{

++++override+func+pushViewController(_+viewController:+UIViewController,+animated:+Bool)+{
++++++++//+first
++++++++let+backItem+=+UIBarButtonItem()
++++++++backItem.title+=+"رجوع"
++++++++self.viewControllers.last?.navigationItem.backBarButtonItem+=+backItem
++++++++//+then
++++++++super.pushViewController(viewController,+animated:+animated)

++++}

}|code-block|syntax|javascript|2713763|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|$]]

although these answers fix the problem but this could be some useful 

<pre><code>class MainNavigatioController: UINavigationController {

 override func pushViewController(_ viewController: UIViewController, animated: Bool) {
 // first
 let backItem = UIBarButtonItem()
 backItem.title = "رجوع"
 self.viewControllers.last?.navigationItem.backBarButtonItem = backItem
 // then
 super.pushViewController(viewController, animated: animated)

 }

}
</code></pre>

blocks|key|141756|text|Swift+4|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|141757|虽然前面说的为segue做准备是正确的，而且back按钮是属于前一个VC的，但它只是添加了更多不必要的代码。|141758|最好的做法是在viewDidLoad中设置当前VC的标题，它会自动在下一个VC上正确地设置后退按钮标题。这句话对我很有效|141759|navigationController?.navigationBar.topItem?.title+=+"Title"|code-block|syntax|javascript|141760|entityMap^0|0|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|U|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|V|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Swift 4

While the previous saying to prepare for segue is correct and its true the back button belongs to the previous VC, its just adding a bunch more unnecessary code.

The best thing to do is set the title of the current VC in viewDidLoad and it'll automatically set the back button title correctly on the next VC. This line worked for me

<pre><code>navigationController?.navigationBar.topItem?.title = "Title"
</code></pre>

blocks|key|140638|text|这适用于Swift+5|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|140639|self.navigationItem.backBarButtonItem?.title+=+""|code-block|syntax|javascript|140640|请注意，它将对下一个推送的视图控制器有效，而不是对显示器上的当前视图控制器有效，这就是为什么它非常混乱！|140641|另外，检查情节提要并选择previous视图控制器的导航项，然后在Back+Button+(检查器)中键入一些内容。|140642|entityMap^0|4|7|0|0|0|C|8|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

This works for Swift 5:

<pre><code>self.navigationItem.backBarButtonItem?.title = ""
</code></pre>

Please note it will be effective for the next pushed view controller not the current one on the display, that's why it's very confusing! 

Also, check the storyboard and select the navigation item of the previous view controller then type something in the Back Button (Inspector).

blocks|key|141804|text|后退按钮文本和颜色文本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|141805|navigationController?.navigationBar.tintColor+=+.red
navigationController?.navigationBar.topItem?.backButtonTitle+=+"Hi"|code-block|syntax|javascript|141806|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|$]]

Back button text and color text:
<pre><code>navigationController?.navigationBar.tintColor = .red
navigationController?.navigationBar.topItem?.backButtonTitle = &quot;Hi&quot;
</code></pre>

blocks|key|2713506|text|试试这个。它会成功的..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2713507|override+func+prepare(for+segue:+UIStoryboardSegue,+sender:+Any?)+{
++++self.title+=+""
}|code-block|syntax|javascript|2713508|上面的代码将隐藏文本，并在导航栏上只显示向后箭头。|2713509|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try this... it will work ....

<pre><code>override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
 self.title = ""
}
</code></pre>

The above code will hide the text and show only the back arrow on navigation bar.

blocks|key|2713741|text|Swift+4|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2713742|在我的例子中，解决方案是在移动到子视图控制器之前清除主视图控制器的导航项目。如果再次显示，则重新设置它|2713743|MasterController|2713744|override+func+viewWillAppear(_+animated:+Bool)+{
++++super.viewWillAppear(animated)
++++navigationItem.title+=+"Master+Title"
}

override+func+viewWillDisappear(_+animated:+Bool)+{
++++super.viewWillDisappear(animated)
++++navigationItem.title+=+""
}|code-block|syntax|javascript|2713745|这就是我如何按下UIViewController并清除子控制器中的后边栏按钮项的方法：|2713746|2713747|let+childController+=+ChildController(collectionViewLayout:+UICollectionViewFlowLayout())
childController.navigationItem.backBarButtonItem?.title+=+""
navigationController?.pushViewController(childController,+animated:+true)|2713748|entityMap^0|0|7|0|0|0|G|0|0|0|0|G|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|12|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|13|8|@]|D|@]|E|$]]|$1|Q|3|I|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|R|3|S|5|L|7|17|8|@]|D|@]|E|$M|N]]|$1|T|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|U|$]]

Swift 4

In my case the solution was to clear the navigation item of the Master View Controller before move to the Child View Controller. And set it again if it is shown again

MasterController

<pre><code>override func viewWillAppear(_ animated: Bool) {
 super.viewWillAppear(animated)
 navigationItem.title = "Master Title"
}

override func viewWillDisappear(_ animated: Bool) {
 super.viewWillDisappear(animated)
 navigationItem.title = ""
}
</code></pre>

And this is how I push a UIViewController and clear the back bar button item in the child controller:

MasterController

<pre><code>let childController = ChildController(collectionViewLayout: UICollectionViewFlowLayout())
childController.navigationItem.backBarButtonItem?.title = ""
navigationController?.pushViewController(childController, animated: true)
</code></pre>

blocks|key|2713957|text|可以将以下代码添加到视图控制器中，您可以从该视图控制器中按下要在其中更改返回按钮文本的视图控制器|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2713958|Swift+5|2713959|self.navigationItem.backBarButtonItem+=+UIBarButtonItem(title:+"",+style:+.plain,+target:+self,+action:+nil)|code-block|syntax|javascript|2713960|例如：|2713961|2713962|ViewController1|ordered-list-item|2713963|ViewController2|2713964|2713965|假设我们想要更新viewcontroller2的后置标题，并且我们正在从viewcontroller1推送viewcontroller2。|2713966|然后你可以使用下面的代码：|2713967|let+vc2+=+storyboard.instantiateViewController(withIdentifier:+"ViewController2")
self.navigationItem.backBarButtonItem+=+UIBarButtonItem(title:++"your+custom+back+button+title",+style:+.plain,+target:+self,+action:+nil)
self.navigationController?.pushViewController(vc2,+animated:+true)|2713968|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|14|8|@]|9|@]|A|$]]|$1|O|3|P|5|N|7|15|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|17|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|18|8|@]|9|@]|A|$]]|$1|V|3|W|5|F|7|19|8|@]|9|@]|A|$G|H]]|$1|X|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|Y|$]]

Following code can be added to a view controller from where you are pushing view controller in which you want to change back button text
Swift 5
<pre><code>self.navigationItem.backBarButtonItem = UIBarButtonItem(title: &quot;&quot;, style: .plain, target: self, action: nil)
</code></pre>
For example:-
<ol>
<li>ViewController1</li>
<li>ViewController2</li>
</ol>
Assume we want to update back title of viewcontroller2 and we are pushing viewcontroller2 from viewcontroller1.
then you can use following code:-
<pre><code>let vc2 = storyboard.instantiateViewController(withIdentifier: &quot;ViewController2&quot;)
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: &quot;your custom back button title&quot;, style: .plain, target: self, action: nil)
self.navigationController?.pushViewController(vc2, animated: true)
</code></pre>

blocks|key|142630|text|在self.navigationController?.pushViewController(vc,+animated:+true)之前设置self.title+=+""。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|142631|entityMap^0|1|1T|1Y|F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Set <code>self.title = ""</code>
before <code>self.navigationController?.pushViewController(vc, animated: true)</code>.

blocks|key|2713552|text|override+func+viewWillAppear(_+animated:+Bool)+{

++++self.tabBarController?.navigationItem.title+=+"Notes"

++++let+sendButton+=+UIBarButtonItem(title:+"New",+style:+.plain,+target:+self,+action:+#selector(goToNoteEditorViewController))

++++self.tabBarController?.navigationItem.rightBarButtonItem+=+sendButton
}

func+goToNoteEditorViewController(){
+++//+action+what+you+want
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2713553|希望它能帮上忙！！#swift+3|unstyled|2713554|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>override func viewWillAppear(_ animated: Bool) {

 self.tabBarController?.navigationItem.title = "Notes"

 let sendButton = UIBarButtonItem(title: "New", style: .plain, target: self, action: #selector(goToNoteEditorViewController))

 self.tabBarController?.navigationItem.rightBarButtonItem = sendButton
}

func goToNoteEditorViewController(){
 // action what you want
}
</code></pre>

Hope it helps!! #swift 3

blocks|key|139242|text|如果从页面视图控制器页中推动视图控制器，则不能更新导航控制器的后退按钮标题。要解决此问题，请创建一个返回到父视图控制器的委托(您也可以遍历视图控制器层次结构返回到父视图控制器)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|139243|此外，后退按钮有字符限制。如果超过字符限制，系统将默认为"Back“。它不会为您截断。例如：|139244|backItem.title+=+"Birthdays/Anniversaries"+//+Get's+converted+to+"Back".
backItem.title+=+"Birthdays/Anniversa…"+//+Fits+and+shows+as+is.|code-block|syntax|javascript|139245|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you are pushing a view controller from page view controller page, you cannot update the navigation controller's back button title. To solve this create a delegate back to your parent view controller (you may also be able to traverse the view controller hierarchy back up to the parent). 

Furthermore, Back buttons have a character limit. If you exceed that character limit, the system will default to "Back". It will not truncate for you. For example:

<pre><code>backItem.title = "Birthdays/Anniversaries" // Get's converted to "Back".
backItem.title = "Birthdays/Anniversa…" // Fits and shows as is.
</code></pre>

blocks|key|141762|text|Swift+4.2的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|141763|let+backItem+=+UIBarButtonItem()
backItem.title+=+""
navigationItem.backBarButtonItem+=+backItem|code-block|syntax|javascript|141764|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|$]]

for Swift 4.2

<pre><code>let backItem = UIBarButtonItem()
backItem.title = ""
navigationItem.backBarButtonItem = backItem
</code></pre>

blocks|key|2713944|text|注意事项:如果您对其中任何一个多星建议有问题，请确保您是在viewDidLoad()中注册UITableViewCell，而不是从init()注册|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2713945|entityMap^0|T|D|19|F|1T|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

GOTCHA: If you are having trouble with any of the many-starred suggestions, ensure that you are registering your <code>UITableViewCell</code>s in <code>viewDidLoad()</code>, not from <code>init()</code>

blocks|key|140742|text|这对我很管用。Swift+5|type|unstyled|depth|inlineStyleRanges|entityRanges|data|140743|navigationItem.backButtonTitle+=+""|code-block|syntax|javascript|140744|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|$]]

It works for me. Swift 5
<pre><code>navigationItem.backButtonTitle = &quot;&quot;
</code></pre>

blocks|key|139450|text|已检查解决方案并在Swift+5中工作|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|139451|下面我针对不同的情况提出了一些解决方案：|139452|1.从后退按钮中删除文本|139453|从后退按钮中删除文本的最佳解决方案是在viewDidLoad()中添加：|139454|navigationItem.backBarButtonItem+=+UIBarButtonItem()|code-block|syntax|javascript|139455|2.在后退按钮上设置自己的文本|139456|如果您想设置自己的标题，可以通过设置backButton的标题来实现：|139457|let+backButton+=+UIBarButtonItem()
backButton.title+=+"My+Title"
navigationItem.backBarButtonItem+=+backItem|139458|3.所有VC上的后退按钮均为空|139459|如果您想在整个应用程序中创建通用样式--只需返回箭头而不包含文本，请为所有视图控制器创建基础VC：|139460|class+BaseViewController:+UIViewController+{
++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()

++++++++navigationItem.backBarButtonItem+=+UIBarButtonItem()
++++}
}|139461|上面提供的解决方案允许您在以后想要进行一些异常时自定义back按钮，方法是添加额外的变量并在特定的ViewController、f.ex中覆盖它：|139462|class+BaseViewController:+UIViewController+{

++++var+customBackButtonTitle:+String?

++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()

++++++++var+backButton+=+UIBarButtonItem()
++++++++if+let+text+=+customBackButtonTitle+{
++++++++++++backButton.title+=+text
++++++++}
++++++++navigationItem.backBarButtonItem+=+backButton
++++}
}|139463|entityMap^0|9|7|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1C|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|1D|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|1E|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|1F|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1G|8|@]|D|@]|E|$]]|$1|U|3|V|5|N|7|1H|8|@]|D|@]|E|$O|P]]|$1|W|3|X|5|6|7|1I|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1J|8|@]|D|@]|E|$]]|$1|10|3|11|5|N|7|1K|8|@]|D|@]|E|$O|P]]|$1|12|3|13|5|6|7|1L|8|@]|D|@]|E|$]]|$1|14|3|15|5|N|7|1M|8|@]|D|@]|E|$O|P]]|$1|16|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|17|$]]

Solution checked and work in Swift 5

Below I put few solutions for different cases:

<h2>1. Remove text from back button</h2>

The best solution to remove text from back button is to add in viewDidLoad():

<pre><code>navigationItem.backBarButtonItem = UIBarButtonItem()
</code></pre>

<h2>2. Set own text on back button</h2>

In case you want to set your own title, do it by setting title of backButton:

<pre><code>let backButton = UIBarButtonItem()
backButton.title = "My Title"
navigationItem.backBarButtonItem = backItem
</code></pre>

<h2>3. Empty back button on all VC</h2>

If you want to create common style in entire app - to have just arrow back without text, create base VC for all your View Controllers:

<pre><code>class BaseViewController: UIViewController {
 override func viewDidLoad() {
 super.viewDidLoad()

 navigationItem.backBarButtonItem = UIBarButtonItem()
 }
}
</code></pre>

Solution presented above let you customize back button in the future if you want to make some exception later, by adding additional variable and overriding it in specific ViewController, f.ex:

<pre><code>class BaseViewController: UIViewController {

 var customBackButtonTitle: String?

 override func viewDidLoad() {
 super.viewDidLoad()

 var backButton = UIBarButtonItem()
 if let text = customBackButtonTitle {
 backButton.title = text
 }
 navigationItem.backBarButtonItem = backButton
 }
}
</code></pre>

How do you remove the back button text.

Current back button:

<blockquote>
 &lt; Back
</blockquote>

Desired back button:

<blockquote>
 &lt; AnythingElse
</blockquote>

None of these have worked:

<pre><code>self.navigationItem.backBarButtonItem?.title = "Back"
self.backItem?.title = ""
self.navigationController?.navigationBar.backItem?.title = ""
self.navigationItem.backBarButtonItem?.title = ""
self.navigationController?.navigationItem.backBarButtonItem?.title="Back"
self.navigationController?.navigationBar.backItem?.title = ""
self.navigationController?.navigationItem.backBarButtonItem?.title
</code></pre>

How to set back button text in Swift

Swift

如何删除后退按钮文本。当前后退按钮： <后退所需的后退按钮： < AnythingElse这些都不起作用：self.navigationItem.backBarButtonItem?.title = "Back"self.backItem?.title = ""self.navigationController?.navigationBar.backItem?.title = ""self.nav

问如何在Swift中设置后退按钮文本
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回答 26

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问如何在Swift中设置后退按钮文本
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