Flutter TextField 高度设置,无边框

//边框样式
OutlineInputBorder _outlineInputBorder = OutlineInputBorder(
    gapPadding: 0,
    borderSide: BorderSide.none,
);

TextField(
    decoration: InputDecoration(
        fillColor: Colors.grey[50],//背景颜色，必须结合filled: true,才有效
            filled: true,//重点，必须设置为true，fillColor才有效
            isCollapsed: true,//重点，相当于高度包裹的意思，必须设置为true，不然有默认奇妙的最小高度
            contentPadding: EdgeInsets.symmetric(horizontal: 8, vertical: 10),//内容内边距，影响高度
            border: _outlineInputBorder,//边框，一般下面的几个边框一起设置
            focusedBorder: _outlineInputBorder,
            enabledBorder: _outlineInputBorder,
            disabledBorder: _outlineInputBorder,
            focusedErrorBorder: _outlineInputBorder,
            errorBorder: _outlineInputBorder,
        ),
    ),
)