Question

按钮是在故事板中创建的，我想添加一个动作。

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

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

这不起作用。感谢

Answer 1

只需在swift类中创建一个函数，如下所示

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

通过从按钮拖动到视图控制器，在故事板中连接它。

Answer 2

见我的。

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

初始化UIBarButtonItem

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

OR

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

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!")
}

向UIBarButtonItem Swift添加动作

4 个答案: