如何限制TextFormField中的字符数？

Question

有没有办法在dart语言中保持最大输入长度固定TextFormField？

Answer 1

使用inputFormatters财产.以下代码将textFormField的长度限制为42:

new TextFormField(
  inputFormatters: [
    new LengthLimitingTextInputFormatter(42),
  ],
);

更新:首先导入包.import 'package:flutter/services.dart';

Answer 2

用 maxLength

TextFormField(
  controller: _deskripsiController,
  onFieldSubmitted: (String value){
        setState(() {
          _deskripsiController.text = value;
        });
  },
  decoration: const InputDecoration(
        border: const UnderlineInputBorder(),
        labelText: "Deskripsi",
  ),
  maxLength: 8,
)

Answer 3

最好的方法是 inputFormatters 选项：

inputFormatters: [
   new LengthLimitingTextInputFormatter(11),// for mobile 
],