UITextField输入金额的限制
- 小数点前9位,后面两位,如果不加小数点,最大位数是9位,加上小数点,最大位数是12位,超出最大位数可删除。
- 若0前面有小数点，则后面可为（0~9），反之后面只能输入小数点。
- 小数点后面不能输入小数点。
- 只能输入0~9+小数点。
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