swift3 – swift 3.0 UIBarButtonItem动作不起作用

发布时间：2020-12-14 02:28:05 所属栏目：百科来源：网络整理

导读：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click事件.我添加了断点

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click事件.我添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.

Swift 3.0

在ViewDidLoad()中声明UIBarButton

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

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

完全声明viewDidLoad()

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

任何应该工作.

对于action参数,您可以明确指定ViewController名称,也可以只说自己.

action: #selector(self.logOut)

（编辑：李大同）

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