flutter 限制輸入數字

TextInputType.number隻能彈出數字鍵盤,還是可以輸入特殊字元等,需要加上WhitelistingTextInputFormatter.digitsOnly

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

WhitelistingTextInputFormatter 源碼裡寫的很清楚

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

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