如何取消对具有自定义 FocusNode 的 TextField 的聚焦？

我知道不集中注意力的一般答案是使用这段代码：FocusScope.of(context).requestFocus(new FocusNode());

但是当 TextField 有自定义 focusNode 时，这段代码似乎不起作用。

SystemChannels.textInput.invokeMethod('TextInput.hide');仍然有效，但它只删除了键盘 - 字段本身仍然处于选中状态。

代码（删除无关部分）：

class RegisterScreen extends StatelessWidget {
  final phoneNumberTEC = TextEditingController();
  final passwordTEC = TextEditingController();
  final passwordFocusNode = FocusNode();

  @override
  Widget build(BuildContext context) {
    return this.keyboardDismisser(
      context: context,
      child: Scaffold(
        appBar: new AppBar(
          title: new Text("Register"),
        ),
        body: this.page(context),
        resizeToAvoidBottomPadding: false,
      ),
    );
  }

  Widget keyboardDismisser({BuildContext context, Widget child}) {
    final gesture = GestureDetector(
      onTap: () {
        this.passwordFocusNode.unfocus();
        FocusScope.of(context).requestFocus(new FocusNode());
        SystemChannels.textInput.invokeMethod('TextInput.hide');
      },
      child: child,
    );
    return gesture;
  }

  Widget page(BuildContext context) {
    return Column(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: <Widget>[
          Container(
            padding: new EdgeInsets.all(16.0),
            child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  this.phoneNumberTextField(context),
                  this.passwordTextField(context),
                ]
            ),
          ),
          // cutting irrelevant widgets out
          )
        ]
    );
  }

  Widget phoneNumberTextField(BuildContext context) {
    return TextField(
      controller: this.phoneNumberTEC,
      decoration: InputDecoration(hintText: "Phone number"),
      onSubmitted: (string) {
        FocusScope.of(context).requestFocus(this.passwordFocusNode);
      },
    );
  }

  Widget passwordTextField(BuildContext context) {
    return TextField(
      controller: this.passwordTEC,
      decoration: InputDecoration(hintText: "Password"),
      obscureText: true,
      focusNode: this.passwordFocusNode,
      onSubmitted: (string) {
        this.performRegister(context);
      },
    );
  }

}

这是与 @kasiara 的答案类似的答案，但另一种方式。

FocusScope.of(context).unfocus();
_textEditingController.clear();