ios - 触摸文本框不起作用

Question

我正在尝试在 UITextField 上设置 ontouch 监听器，但它根本不起作用，这是我的代码:

class SettingsVC: BaseVC {


    @IBOutlet weak var languageField: SkyFloatingLabelTextField!
    @IBOutlet weak var btnburgerMenu: UIButton!
    @IBOutlet weak var headerLbl: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        languageField.addTarget(self, action: "myTargetFunction:", for: UIControlEvents.touchDown)
    }

    func myTargetFunction(textField: SkyFloatingLabelTextField) {
        print("test")
    }

}

这是我遇到的错误

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[IFO.SettingsVC myTargetFunction:]: unrecognized selector sent to instance 0x7fac8b61ff30'

异常的原因是什么？

Answer 1

应该是这样的——

languageField.addTarget(self, action: #selector(YourViewController.myTargetFunction(sender:)), for: UIControlEvents.touchDown)

或者像这样使用

languageField.addTarget(self, action: #selector(self.myTargetFunction(_:)), forControlEvents: .touchDown)

然后像这样调用函数

func myTargetFunction(_ textField: SkyFloatingLabelTextField) {
    print("test")
}