数字格式化程序货币类型最多为2个小数

I want to covert a String to currency and keep 2 decimal spaces:

我想把一个字符串转换成货币，保留两个小数:

let formatter = NumberFormatter()
formatter.maximumFractionDigits = 2
formatter.numberStyle = .currency
formatter.locale = Locale(identifier: "zh_CN")
formatter.number(from: "¥12")        // Output 12 correct.
formatter.number(from: "¥1213.1263") // Output 1213.1263
formatter.string(from: 1213.1263)    // Output "￥1,213.13"

You can see the output in comments. Why not the formatter.number(from: "¥1213.1263") output 1213.13? I have set the max fraction digits is 2.

您可以在注释中看到输出。为什么不格式化程序。数量(来自:¥1213.1263)输出1213.13 ?我设置了最大分数位数是2。

1 个解决方案

#1

The maximumFractionDigits and all similar properties are only used for formatting the number as a string. They are not used for rounding numbers when using NumberFormatter.number(from: String).

最大值和所有类似的属性只用于将数字格式化为字符串。当使用NumberFormatter时，它们不用于四舍五入数字。(来自:字符串)。