How to programmatically set action for barButtonItem in swift 3?

Question

Here is what I used previously,

var barButtonItem = UIBarButtonItem(image: backImgs, style: UIBarButtonItemStyle.plain, target: self, action: Selector(\"menu         


        

Answer 1

In Swift 5

//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")
}

Answer 2

One line of code on Swift 3 for iOS 10.1:

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

Answer 3

In Swift 3, you can add UIBarButtonItem like that,

let addButton = UIBarButtonItem(image:UIImage(named:"your_icon_name"), style:.plain, target:self, action:#selector(YourControllerName.buttonAction(_:)))
addButton.tintColor = UIColor.white
self.navigationItem.rightBarButtonItem = addButton

And handle button action like that,

func buttonAction(_ sender: UIBarButtonItem) {

}

Hope it helps.

Answer 4

create an extension for barbutton item.

 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(){

   }
 }

And call it from viewDidLoad()

 self.navigationItem.addSettingButtonOnRight()

Answer 5

ex:-

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

Answer 6

for Swift 4 add in viewDidLoad:

navigationItem.rightBarButtonItem = UIBarButtonItem(
    barButtonSystemItem: UIBarButtonSystemItem.add, 
    target: self, 
    action: #selector(addTransaction)
)