如何防止在按下Flutter中的Submit键时键盘消失? [英] How to prevent keyboard from dismissing on pressing submit key in flutter?

问题描述

我正在开发一个Flutter应用程序，用户可以在其中键入消息，然后按键盘上的发送按钮以发送消息.问题是，当我按下发送按钮时，消息被发送但键盘自动被关闭.如何防止这种情况发生? 预先感谢.

I'm making a flutter application where user can type a message and hit send button IN THE KEYBOARD to send the message. The problem is when I press the send button the message gets send but the keyboard gets automatically dismissed. How can I prevent that from happening? Thanks in advance.

TextField(
  autofocus: true,
  keyboardType: TextInputType.multiline,
  maxLines: null,
  decoration: new InputDecoration.collapsed(
    hintText: "Let's talk",
    border: UnderlineInputBorder(
      borderRadius: BorderRadius.circular(1),
    ),
  ),
  textInputAction: TextInputAction.send,
  onSubmitted: null,
)

推荐答案

这对我有用:-

首先创建一个FocusNode并将其分配给您的文本字段，请执行以下操作:-

First Create a FocusNode and assign it to your textfield, do the following :-

FocusNode是一个寿命很长的组件，因此请使用initState方法对其进行初始化:-

The FocusNode is a long lived component so initialize it in the initState method:-

FocusNode inputFieldNode;

 @override
  void initState() {
    super.initState();
    inputFieldNode = FocusNode();
  }

不要忘记在处理窗体后用dispose方法清理FocusNode:-

Do not forget to cleanup the FocusNode in dispose method after the Form is disposed:-

 @override
  void dispose() {
    inputFieldNode.dispose();
    super.dispose();
  }

将FocusNode分配给文本字段，并在onSubmitted:中编写以下代码:-

Assign the FocusNode to the textfield and write the following code in onSubmitted::-

TextField(
            focusNode: inputFieldNode,
            onSubmitted: (String) => FocusScope.of(context).requestFocus(inputFieldNode),
          )

现在，即使按下提交按钮，文本字段也不会失去焦点.

Now the textfield will not lose focus even after pressing the submit button.

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