本文介绍了如何在swift 3中使用addTarget方法的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这是我的按钮对象
let loginRegisterButton:UIButton = { let button = UIButton(type: .system) button.backgroundColor = UIColor(r: 50 , g: 80, b: 130) button.setTitle("Register", for: .normal) button.translatesAutoresizingMaskIntoConstraints = false button.setTitleColor(.white, for: .normal) button.addTarget(self, action:#selector(handleRegister), for: .touchUpInside) return button }()这是我的函数
func handleRegister(){ FIRAuth.auth()?.createUser(withEmail: email, password: password,completion: { (user, error) in if error != nil { print("Error Occured")} else {print("Successfully Authenticated")} }) }我收到编译错误,如果addTarget删除它compi成功
I'm getting compile error, if addTarget removed it compiles successfully
推荐答案是的,如果没有参数,请不要添加()
Yes, don't add "()" if there is no param
button.addTarget(self, action:#selector(handleRegister), for: .touchUpInside).如果你想得到寄件人
button.addTarget(self, action:#selector(handleRegister(_:)), for: .touchUpInside). func handleRegister(sender: UIButton){ //... }编辑:
button.addTarget(self, action:#selector(handleRegister(_:)), for: .touchUpInside)不再有效,你需要更换 _ 在选择器中,您在函数头中使用了变量名,在这种情况下,它将是 sender ,因此工作代码变为:
no longer works, you need to replace _ in the selector with a variable name you used in the function header, in this case it would be sender, so the working code becomes:
button.addTarget(self, action:#selector(handleRegister(sender:)), for: .touchUpInside)更多推荐
如何在swift 3中使用addTarget方法
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