快速将货币字符串转换为双精度 [英] Swift convert Currency string to double

问题描述

我有一个字符串， $ 4,102.33 ，需要将其转换为双精度。这将永远是美国。我唯一的方法是破解 $ 和，，然后转换为double。好像 NSFormatter 只能让我转换为货币，而不能转换为货币。除了删除 $ 和，之外，是否有内置功能或更好的方法？

I have a string, "$4,102.33" that needs to be converted to double. This will always be US. My only way is a hack to strip out the $ and , and then convert to double. Seems like NSFormatter only lets me convert TO a currency and not from it. Is there a built-in function or better way than just removing the $ and ,? prior to converting it to double?

推荐答案

NumberFormatter 可以转换为和？从字符串。同样， Double 不能精确表示某些数字，因为它是基于2的。使用 Decimal 会更慢但更安全。

NumberFormatter can convert to and from string. Also Double cannot represent certain numbers exactly since it's based 2. Using Decimal is slower but safer.

let str = "$4,102.33"

let formatter = NumberFormatter()
formatter.numberStyle = .currency

if let number = formatter.number(from: str) {
    let amount = number.decimalValue
    print(amount)
}

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