目標：按下發送按鈕時，不要關閉鍵盤并保持打開/聚焦問題：按下發送按鈕時，鍵盤關閉，然后由于focusNode.requestFocus重新打開，之后按下發送按鈕時，鍵盤不再打開 尋找兩個選項：
- （理想）按下發送按鈕時不要讓鍵盤關閉
- （好的）無論發送按鈕關閉多少次都打開鍵盤
這是示例用戶界面：
return Form(
key: _formKey,
child: Row(
children: <Widget>[
Expanded(
child: TextFormField(
focusNode: chatController.focusNode,
// textInputAction: TextInputAction.none, // didn't help
// onEditingComplete: () {}, // didn't help
)
),
IconButton(
icon: const Icon(Icons.send),
onPressed: () async {
SystemChannels.textInput
.invokeMethod('TextInput.hide');
if (_formKey.currentState!.validate()) {
await chatController.sendMessage(context);
}
}
),
],
)
);
這是控制器：
late FocusNode focusNode;
@override
void onReady() async { // tried onInit as well
focusNode = FocusNode();
super.onReady();
}
void sendMessage(BuildContext context) async {
// focusNode.unfocus(); // didn't help
// focusNode2.requestFocus(); // tried to give focus to another widget and take it back, but didn't help
final a1 = focusNode.hasFocus; // except the very first call, this is true even when focusNode.unfocus() is called
// neither of these work the second time
focusNode.requestFocus();
// FocusScope.of(context).requestFocus(focusNode);
}
我能夠跟蹤代碼，并且當第二次呼叫此處的焦點管理器時，此條件始終為真：
if (hasPrimaryFocus && (_manager!._markedForFocus == null || _manager!._markedForFocus == this)) {
即使鍵盤已關閉，它也會回傳而不會再次嘗試打開鍵盤
uj5u.com熱心網友回復：
你有一個流浪者：
SystemChannels.textInput.invokeMethod('TextInput.hide');
在您的IconButton回呼中，它應該在洗掉后作業。
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