flutter 限制输入数字

TextInputType.number只能弹出数字键盘,还是可以输入特殊字符等,需要加上WhitelistingTextInputFormatter.digitsOnly

 TextField(
      inputFormatters: [
        LengthLimitingTextInputFormatter(11),
        WhitelistingTextInputFormatter.digitsOnly
      ],
      keyboardType: TextInputType.number,

WhitelistingTextInputFormatter 源码里写的很清楚

  /// A [WhitelistingTextInputFormatter] that takes in digits `[0-9]` only.
  static final WhitelistingTextInputFormatter digitsOnly
      = WhitelistingTextInputFormatter(RegExp(r'\d+'));

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