可以使用Padding并设置expand：true来填充容器

Container(
    height: 300,
    width: 300,
    decoration: BoxDecoration(borderRadius: BorderRadius.circular(150), color: Colors.amber),
    padding: const EdgeInsets.all(50),
    child: TextFormField(
      expands: true,
      maxLines: null,
      decoration: const InputDecoration(border: InputBorder.none),
    ),
  ),

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的数据

只需使用ClipRRect Package TextFormField

Container(
                            height: 300,
                            width: 300,
                            padding: const EdgeInsets.all(5),
                            decoration: BoxDecoration(
                              color: Colors.amber,
                              shape: BoxShape.circle,
                            ),
                            child:ClipRRect(
                              child: TextFormField(
                                expands: true,
                                maxLines: null,
                                textAlign: TextAlign.center,
                                textAlignVertical: TextAlignVertical.center,
                                keyboardType: TextInputType.multiline,
                                decoration: InputDecoration(
                                  border: OutlineInputBorder(borderRadius: BorderRadius.circular(500)),
                                  filled: false,
                                ),
                              ),
                            )

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）的情况）

只需将TextFormField与Container Package 在一起，并给予Container边框半径，并在TextFormFields的装饰中应用InputBorder.none

例如：-
集装箱（

decoration: BoxDecoration(
        color: Color.fromRGBO(173, 239, 209, 1),
        border: Border.all(color: Colors.grey, width: 2),
        borderRadius: BorderRadius.circular(28)),
    child: TextFormField(
      decoration: InputDecoration(
          hintText: "Enter a number", border: InputBorder.none),
    ),

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），