所以我想在打字时验证用户ip。在VC中，我做了以下操作:extensionNetworkSettingsViewController:UITextFieldDelegate{functextFieldShouldReturn(_textField:UITextField)->Bool{self.staticMask.resignFirstResponder()self.staticGateway.resignFirstResponder()self.staticIp.resignFirstResponder()self.staticDns.resignFirstResponder()r