How to set the action for a UIBarButtonItem in Swift

Question

How can the action for a custom UIBarButtonItem in Swift be set   The following code successfully places the button in the navigation bar   var b   UIBarButtonItem title   Continue   style   Plain  target  self  action nil  self navigationItem rightBarButtonItem   b   Now  I would like to call func sayHello     println  Hello     when the button is touched  My efforts so far   var b   UIBarButtonItem title   Continue   style   Plain  target  self  action sayHello      also with  sayHello   sayHello     and  sayHello       and    var b   UIBarButtonItem title   Continue   style   Plain  target  self  action  selector sayHello       also with  sayHello   sayHello     and  sayHello       and    var b   UIBarButtonItem title   Continue   style   Plain  target  self  action  selector self sayHello       also with  self sayHello   self sayHello     and  self sayHello       Note that sayHello   appears in the intellisense  but does not work   Thanks for your help   EDIT  For posterity  the following works   var b   UIBarButtonItem title   Continue   style   Plain  target  self  action  sayHello

User · Accepted Answer

As of Swift 2 2  there is a special syntax for compiler-time checked selectors  It uses the syntax   selector methodName    Swift 3 and later   var b   UIBarButtonItem      title   Continue       style   plain      target  self      action   selector sayHello sender       func sayHello sender  UIBarButtonItem        If you are unsure what the method name should look like  there is a special version of the copy command that is very helpful  Put your cursor somewhere in the base method name  e g  sayHello  and press  Shift Control Option C  That puts the    Symbol Name    on your keyboard to be pasted  If you also hold Command it will copy the    Qualified Symbol Name    which will include the type as well   Swift 2 3   var b   UIBarButtonItem      title   Continue       style   Plain      target  self      action   selector sayHello         func sayHello sender  UIBarButtonItem        This is because the first parameter name is not required in Swift 2 3 when making a method call   You can learn more about the syntax on swift org here  https   swift org blog swift-2-2-new-features  compile-time-checked-selectors

User · Answer

Swift 4 5 example button target   self button action    selector buttonClicked sender      objc func buttonClicked sender  UIBarButtonItem

User · Answer

May this one help a little more   Let suppose if you want to make the bar button in a separate file for modular approach  and want to give selector back to your viewcontroller  you can do like this  -    your Utility File  class GeneralUtility        class func customeNavigationBar viewController  UIViewController title String           let add   UIBarButtonItem title   Play   style   plain  target  viewController  action   selector SuperViewController buttonClicked sender              viewController navigationController  navigationBar topItem  rightBarButtonItems    add             Then make a SuperviewController class and define the same function on it   class SuperViewController  UIViewController        override func viewDidLoad             super viewDidLoad                  Do any additional setup after loading the view             objc func buttonClicked sender  UIBarButtonItem               and In our base viewController which inherit your SuperviewController class  override the same function  import UIKit  class HomeViewController  SuperViewController        override func viewDidLoad             super viewDidLoad               Do any additional setup after loading the view             override func viewWillAppear   animated  Bool            GeneralUtility customeNavigationBar viewController  self title  Event                objc override func buttonClicked sender  UIBarButtonItem          print  button clicked                  Now just inherit the SuperViewController in whichever class you want this barbutton   Thanks for the read

User · Answer

Swift 5  amp  iOS 13  Programmatic Example  You must mark your function with  objc  see below example  No parenthesis following after the function name  Just use  selector name   private or public doesn t matter  you can use private   Code Example override func viewWillAppear   animated  Bool        super viewWillAppear animated           let menuButtonImage   UIImage systemName   quot flame quot       let menuButton   UIBarButtonItem image  menuButtonImage  style   plain  target  self  action   selector didTapMenuButton       navigationItem rightBarButtonItem   menuButton     objc public func didTapMenuButton         print  quot Hello World quot

User · Answer

Swift 5  if you have created UIBarButtonItem in Interface Builder and you connected outlet to item and want to bind selector programmatically   Don t forget to set target and selector    addAppointmentButton action    selector moveToAddAppointment  addAppointmentButton target   self   objc private func moveToAddAppointment          self presenter goToCreateNewAppointment

[ios] How to set the action for a UIBarButtonItem in Swift

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