swift - 向 UIBarButtonItem Swift 添加操作

Question

按钮是在情节提要中创建的，我想添加一个动作。

self.cancel.action = NSSelectorFromString("cancel:")

func cancel(sender: UIBarButtonItem) ->() {
}

这不起作用。谢谢

Answer 1

只需在您的 swift 类中创建一个函数，如下所示

@IBAction func cancel() {
   // your code
}

并通过从按钮到视图控制器的 ctrl 拖动将其连接到情节提要中。

Answer 2

见我的。

1. 将 UIButton 添加到 UIBarbuttonitem。

   self.navigationController?.navigationBarHidden = false
   
   //making a button
   var button: UIButton = UIButton()
   button.setImage(UIImage(named: "person-icon.jpg"), forState: .Normal)
   button.frame = CGRectMake(0, 0, 25, 25)
   button.targetForAction("actioncall", withSender: self)
   button.addTarget(self, action: "actioncall", forControlEvents: UIControlEvents.TouchUpInside)
   
   //making a UIBarbuttonItem on UINavigationBar
   var rightItem:UIBarButtonItem = UIBarButtonItem()
   rightItem.customView = button        
   self.navigationItem.rightBarButtonItem = rightItem
   

2. 初始化一个 UIBarButtonItem

   let rightNavItem = UIBarButtonItem(image: UIImage(named: "search1x"), landscapeImagePhone: nil, style: UIBarButtonItemStyle.Plain, target: self, action: "actioncall")
   navigationItem.rightBarButtonItem = rightNavItem
   

3. 或者

   let rightNavItem = UIBarButtonItem()
   rightNavItem.action = "action call"
   
   
   //Anticipated Method on clicking uibarbuttonitem
   func actioncall(){
   }
   

Answer 3

@IBAction func action() {
   // your code
}       

   var button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
   button.frame = CGRectMake(100, 100, 100, 50)
   button.backgroundColor = UIColor.greenColor()
   button.setTitle("Button", forState: UIControlState.Normal)
   button.addTarget(self, action: "action", forControlEvents: UIControlEvents.TouchUpInside)
   self.view.addSubview(button)

Answer 4

或者如果选择器在不同的类中

let barBtn = UIBarButtonItem(title: nil, style: UIBarButtonItemStyle.Plain, target: self, action: #selector(CustomToolbarItemsClass.testSelector))


//This is in CustomToolbarItemsClass class
@objc static func testSelector(){
 print("Hello!")
}