swift3 - swift 3.0 UIBarButtonItem 操作不起作用

Question

let leftbarbuttonitem = UIBarButtonItem(title:"Reset",style: .plain, target: self, action: #selector(tapResetButton(_:)))

    func tapResetButton(_ sender:UIBarButtonItem){
        count = 0
        numberLabel.text = "0"

    }

该操作无法响应单击事件。我加了断点然后发现它甚至没有进入函数。我不知道我的代码有什么问题。任何答案将不胜感激。提前致谢。

Answer 1

Swift 3.0

在 ViewDidLoad() 中声明 UIBarButton

override func viewDidLoad() {
    super.viewDidLoad()
    let logout: UIBarButtonItem = UIBarButtonItem.init(title: "Logout", style: .plain, target: self, action: #selector(ViewController.logOut))
}

func logOut() {
  print("LogOut")
}

声明 UIBarButtonItem OutSide ViewDidLoad()

var logout:UIBarButtonItem = UIBarButtonItem()

override func viewDidLoad() {
        super.viewDidLoad()
        logout = UIBarButtonItem.init(title: "Logout", style: .plain, target: self, action: #selector(ViewController.logOut))
}

func logOut() {
      print("LogOut")
}

完全在 viewDidLoad() 之外声明

lazy var logout: UIBarButtonItem = {
    UIBarButtonItem.init(title: "Logout", style: .plain, target: self, action: #selector(ViewController.logOut))
}()

任何应该工作。

对于您的操作参数，您可以指定 ViewController明确命名，或者你可以直接说 self .

action: #selector(self.logOut)