blocks|key|4393166|text|例如：-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4393167|navigationItem.rightBarButtonItem+=+UIBarButtonItem(title:+"Add",+style:+.plain,+target:+self,+action:+#selector(addTapped))|code-block|syntax|javascript|4393168|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|$]]

ex:- 

<pre><code>navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Add", style: .plain, target: self, action: #selector(addTapped))
</code></pre>

blocks|key|4393239|text|如果有人在使用customView|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4393240|barButtonItem.customView?.addGestureRecognizer(UITapGestureRecognizer(target:+self,+action:+#selector(onBarButtonItemClicked)))|code-block|syntax|javascript|4393241|entityMap^0|7|A|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|$]]

If anyone is using <code>customView</code>:

<pre><code>barButtonItem.customView?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onBarButtonItemClicked)))
</code></pre>

blocks|key|4393193|text|你只需要改变你的selector语法，从Swift+3开始，你需要在你的函数调用中指定方法的第一个参数名，所以像这样改变你的选择器。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4393194|#selector(menuButtonTapped(sender:))|code-block|syntax|javascript|4393195|你的方法应该是这样的。|4393196|func+menuButtonTapped(sender:+UIBarButtonItem)+{

}|4393197|entityMap^0|8|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You just need to change your <code>selector</code> syntax as of from Swift 3 you need to specify the first parameter name of method in your function call so change your selector like this.

<pre><code>#selector(menuButtonTapped(sender:))
</code></pre>

And your method should be like this.

<pre><code>func menuButtonTapped(sender: UIBarButtonItem) {

}
</code></pre>

blocks|key|4393225|text|在iOS+10.1的Swift+3上有一行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4393226|navigationController?.navigationBar.topItem?.rightBarButtonItem+=+UIBarButtonItem(title:+"Add",+style:+.plain,+target:+self,+action:+nil)|code-block|syntax|javascript|4393227|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|$]]

One line of code on Swift 3 for iOS 10.1:

<pre><code>navigationController?.navigationBar.topItem?.rightBarButtonItem = UIBarButtonItem(title: "Add", style: .plain, target: self, action: nil)
</code></pre>

blocks|key|4393199|text|let+barButtonItem+=+UIBarButtonItem(image:+UIImage(named:+"backImgs"),
++++++++++++++++++++++++++++++++++++++++++++style:+.plain,
++++++++++++++++++++++++++++++++++++++++++++target:+self,
++++++++++++++++++++++++++++++++++++++++++++action:+#selector(menuButtonTapped))

//+Adding+button+to+navigation+bar+(rightBarButtonItem+or+leftBarButtonItem)
self.navigationItem.rightBarButtonItem+=+barButtonItem

+//+Private+action
@objc+fileprivate+func+menuButtonTapped()+{+//+body+method+here+}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4393200|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>let barButtonItem = UIBarButtonItem(image: UIImage(named: "backImgs"),
 style: .plain,
 target: self,
 action: #selector(menuButtonTapped))

// Adding button to navigation bar (rightBarButtonItem or leftBarButtonItem)
self.navigationItem.rightBarButtonItem = barButtonItem

 // Private action
@objc fileprivate func menuButtonTapped() { // body method here }
</code></pre>

blocks|key|4393570|text|如果有人正在寻找在现有按钮上设置操作的方法(Swift+5)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4393571|if+let+leftBarButtonItem+=+navigationItem.leftBarButtonItem+{
++++leftBarButtonItem.target+=+self
++++leftBarButtonItem.action+=+#selector(onBack(_:))
}


@IBAction+func+onBack(_+sender:+AnyObject)+{
++++_+=+navigationController?.popViewController(animated:+true)
}|code-block|syntax|javascript|4393572|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|$]]

If someone is looking for a way to set the action on an existing button (Swift 5):

<pre><code>if let leftBarButtonItem = navigationItem.leftBarButtonItem {
 leftBarButtonItem.target = self
 leftBarButtonItem.action = #selector(onBack(_:))
}


@IBAction func onBack(_ sender: AnyObject) {
 _ = navigationController?.popViewController(animated: true)
}
</code></pre>

blocks|key|4393553|text|为barbutton项目创建一个扩展。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4393554|+extension+UINavigationItem+{
++++func+addSettingButtonOnRight(){
+++++++let+button+=+UIButton(type:+.Custom)
+++++++button.setTitle("setting",+forState:+.Normal)
+++++++button.titleLabel?.font+=+UIFont.systemFontOfSize(15.0)
+++++++button.layer.cornerRadius+=+5
+++++++button.backgroundColor+=+UIColor.grayColor()
+++++++button.frame+=+CGRect(x:+0,+y:+0,+width:+100,+height:+25)
+++++++button.addTarget(self,+action:+#selector(gotSettingPage),+forControlEvents:+UIControlEvents.TouchUpInside)
+++++++let+barButton+=+UIBarButtonItem(customView:+button)

+++++++self.rightBarButtonItem+=+barButton
+++}

+++func+gotSettingPage(){

+++}
+}|code-block|syntax|javascript|4393555|并从viewDidLoad()调用它|4393556|+self.navigationItem.addSettingButtonOnRight()|4393557|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|$]]

create an extension for barbutton item.

<pre><code> extension UINavigationItem {
 func addSettingButtonOnRight(){
 let button = UIButton(type: .Custom)
 button.setTitle("setting", forState: .Normal)
 button.titleLabel?.font = UIFont.systemFontOfSize(15.0)
 button.layer.cornerRadius = 5
 button.backgroundColor = UIColor.grayColor()
 button.frame = CGRect(x: 0, y: 0, width: 100, height: 25)
 button.addTarget(self, action: #selector(gotSettingPage), forControlEvents: UIControlEvents.TouchUpInside)
 let barButton = UIBarButtonItem(customView: button)

 self.rightBarButtonItem = barButton
 }

 func gotSettingPage(){

 }
 }
</code></pre>

And call it from viewDidLoad()

<pre><code> self.navigationItem.addSettingButtonOnRight()
</code></pre>

blocks|key|4393251|text|对于Swift+4，添加viewDidLoad|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4393252|navigationItem.rightBarButtonItem+=+UIBarButtonItem(
++++barButtonSystemItem:+UIBarButtonSystemItem.add,+
++++target:+self,+
++++action:+#selector(addTransaction)
)|code-block|syntax|javascript|4393253|entityMap^0|C|B|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|$]]

for Swift 4 add in <code>viewDidLoad</code>:

<pre><code>navigationItem.rightBarButtonItem = UIBarButtonItem(
 barButtonSystemItem: UIBarButtonSystemItem.add, 
 target: self, 
 action: #selector(addTransaction)
)
</code></pre>

blocks|key|4393282|text|在Swift+5中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4393283|//For+righter+button+item
let+rightBtn+=+UIBarButtonItem(image:+UIImage(named:+"rightmenu"),+style:+.plain,+target:+self,+action:+#selector(onClickMethod))//Change+your+function+name+and+image+name+here
self.navigationItem.rightBarButtonItem+=+rightBtn
//self.navigationItem.rightBarButtonItem+=+[rightBtn,+anotherBtn]+//If+you+want+to+add+more+buttons+add+like+this

//For+left+bar+button+item
let+leftBtn+=+UIBarButtonItem(image:+UIImage(named:+"rightmenu"),+style:+.plain,+target:+self,+action:+#selector(onClickMethod))+//Change+your+function+name+and+image+name+here
self.navigationItem.leftItemsSupplementBackButton+=+true
self.navigationItem.leftBarButtonItem+=+leftBtn
//self.navigationItem.leftBarButtonItems+=+[leftBtn,+anotherBtn]+//If+you+want+to+add+more+buttons+add+like+this

//This+is+your+function+name
@objc+func+onClickMethod()+{
++++print("Left+bar+button+item")
}|code-block|syntax|javascript|4393284|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|$]]

In Swift 5

<pre><code>//For righter button item
let rightBtn = UIBarButtonItem(image: UIImage(named: "rightmenu"), style: .plain, target: self, action: #selector(onClickMethod))//Change your function name and image name here
self.navigationItem.rightBarButtonItem = rightBtn
//self.navigationItem.rightBarButtonItem = [rightBtn, anotherBtn] //If you want to add more buttons add like this

//For left bar button item
let leftBtn = UIBarButtonItem(image: UIImage(named: "rightmenu"), style: .plain, target: self, action: #selector(onClickMethod)) //Change your function name and image name here
self.navigationItem.leftItemsSupplementBackButton = true
self.navigationItem.leftBarButtonItem = leftBtn
//self.navigationItem.leftBarButtonItems = [leftBtn, anotherBtn] //If you want to add more buttons add like this

//This is your function name
@objc func onClickMethod() {
 print("Left bar button item")
}
</code></pre>

blocks|key|4393530|text|创建一个UIBarButtonItem：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4393531|let+rightButton:+UIBarButtonItem+=+UIBarButtonItem(title:+"Done",+style:+UIBarButtonItemStyle.done,+target:+self,+action:+#selector(LocationViewController.doneButtonClicked(_:)))|code-block|syntax|javascript|4393532|添加到NavigationItem：|4393533|self.navigationItem.rightBarButtonItem+=+rightButton|4393534|关联函数：|4393535|func+doneButtonClicked(_+button:UIBarButtonItem!){++++
++++print("Done+clicked")++++
}|4393536|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Make a UIBarButtonItem:

<pre><code>let rightButton: UIBarButtonItem = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.done, target: self, action: #selector(LocationViewController.doneButtonClicked(_:)))
</code></pre>

Add to NavigationItem:

<pre><code>self.navigationItem.rightBarButtonItem = rightButton
</code></pre>

Associated function:

<pre><code>func doneButtonClicked(_ button:UIBarButtonItem!){ 
 print("Done clicked") 
}
</code></pre>

Here is what I used previously,

<pre><code>var barButtonItem = UIBarButtonItem(image: backImgs, style: UIBarButtonItemStyle.plain, target: self, action: Selector("menuButtonTapped:"))
</code></pre>

But there is some syntax changes for Swift 3.

How to programmatically set action for barButtonItem in swift 3?

Swift

这是我之前使用的代码，var barButtonItem = UIBarButtonItem(image: backImgs, style: UIBarButtonItemStyle.plain, target: self, action: Selector("menuButtonTapped:"))但Swift 3的语法有一些变化。

问如何在swift 3中以编程方式为barButtonItem设置操作？
EN

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问如何在swift 3中以编程方式为barButtonItem设置操作？EN

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问如何在swift 3中以编程方式为barButtonItem设置操作？
EN