聚焦時對齊TextField的labelText

Question

labelText 屬性https://api.flutter.dev/flutter/material/InputDecoration/labelText.html向上移動，當文本字段被聚焦並且你有一個 Inputdecoration 時：

InputDecoration(
  labelText: labelText,
  filled: true,
  enabledBorder: OutlineInputBorder(
    borderSide: const BorderSide(
      color: ImpexColors.grey,
      width: 1.0,
    ),
  ),
  focusedBorder: OutlineInputBorder(
    borderSide: const BorderSide(
      color: ImpexColors.secondaryColor,
      width: 2.0,
    ),
  ),
  labelStyle: TextStyle(
    color: ImpexColors.blue,
  ),
)

然后在上邊框的中間對齊。 當 TextField 聚焦時，是否有可能更改 labelText 的 position？

Answer 1

有可能嗎，基達？

  FocusNode myFocusNode = FocusNode();
  ...
  TextFormField(
      focusNode: myFocusNode,
      decoration: InputDecoration(
        labelStyle: TextStyle(
          height: myFocusNode.hasFocus ? 0.1 : 1, // 0,1 - label will sit on top of border
        ),
        labelText: labelText,
  ...
      ));

還必須添加：

onTap: () =>  setState(() {FocusScope.of(context).requestFocus(myFocusNode);})