set min height of textfiled in flutter

Question

I have a textfiled in container, and i want the textfiled support multiline, so i can not the the height of the container. but how to set the default height of the textfield when there is no word? I have try the contentPadding, but not work. here is my code:

TextField(
                              controller: _textEditingController,
                              decoration: InputDecoration(
                                hintText: "留下你的评论吧~",
                                contentPadding: EdgeInsets.only(left: getMyWidth(10), right: getMyWidth(10)),
                                fillColor: default_bg,
                                filled: true,
                                border: OutlineInputBorder(borderSide: BorderSide.none, borderRadius: BorderRadius.all(Radius.circular(getMyWidth(5)))),
                              ),
                              style: makeBlackStyle(),
                              keyboardType: TextInputType.multiline,
                              maxLines: null,
                              cursorColor: themeColor,
                              onChanged: (str) {
                                setState(() {
                                  inputStr = str;
                                });
                              },
                            )

so, my question is: How to set the default height of the textfield when there is no word? I want to decrease the default height of the textfiled , and need support mulitiline

Answer 1

Replace your code with following to have at-least 3 lines in your TextField:

TextField(
  minLines: 3,
  controller: _textEditingController,
  decoration: InputDecoration(
    hintText: "留下你的评论吧~",
    contentPadding: EdgeInsets.only(left: getMyWidth(10), right: getMyWidth(10)),
    fillColor: default_bg,
    filled: true,
    border: OutlineInputBorder(borderSide: BorderSide.none, borderRadius: BorderRadius.all(Radius.circular(getMyWidth(5)))),
  ),
  style: makeBlackStyle(),
  keyboardType: TextInputType.multiline,
  maxLines: null,
  cursorColor: themeColor,
  onChanged: (str) {
    setState(() {
      inputStr = str;
    });
  },
)