how to programmatically set action for barButtonIt

Question

Here is what I used previously,

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

But there is some syntax changes for Swift 3. Thanks in advance.

Answer 1

for Swift 4 add in viewDidLoad:

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

Answer 2

ex:-

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

Answer 3

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 4

You just need to change your selector 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.

#selector(menuButtonTapped(sender:))

And your method should be like this.

func menuButtonTapped(sender: UIBarButtonItem) {

}

Answer 5

Make a UIBarButtonItem:

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

Add to NavigationItem:

self.navigationItem.rightBarButtonItem = rightButton

Associated function:

func doneButtonClicked(_ button:UIBarButtonItem!){    
    print("Done clicked")    
}

Answer 6

If anyone is using customView:

barButtonItem.customView?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onBarButtonItemClicked)))