NSNumberFormatter SpellOutStyle "and"

Question

是否有类似于 SpellOutStyle 的 NSNumberFormatter "and" 我正在尝试解决 Project Euler #17，它需要用 "and"

写出数字

例如，556 就是五百五十六

使用 NSNumberFormatter，我有以下代码

let formatter = NSNumberFormatter()
formatter.numberStyle = NSNumberFormatterStyle.SpellOutStyle
let number = formatter.stringFromNumber(556)!
print(number) //prints five hundred fifty-six

NSNumberFormatterStyle.SpellOutStyle 未列出 "and"。我可以使用其他方法来打印 "and"?

Answer 1

"five hundred and fifty-six" 对我来说是正确的英语。但是，NSNumberFormatter 不会返回该结果的语言环境。您可以通过继承 NSNumberFormatter:

来自己滚动

class MyNumberFormatter: NSNumberFormatter {
    override init() {
        super.init()
        self.numberStyle = .SpellOutStyle
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func stringFromNumber(number: NSNumber) -> String? {
        // Make sure the number is an integer. Otherwise use NSNumberFormatter default formatting
        guard ceil(number.doubleValue) == floor(number.doubleValue) else {
            return super.stringFromNumber(number)
        }

        switch (number.integerValue - (number.integerValue % 100), abs(number.integerValue % 100)) {
        case let (bigUnit, smallUnit) where abs(bigUnit) >= 100 && 0 < smallUnit && smallUnit < 100:
            return super.stringFromNumber(bigUnit)! + " and " + super.stringFromNumber(smallUnit)!
        default:
            return super.stringFromNumber(number)
        }
    }
}

// Usage:
let formatter = MyNumberFormatter()
print(formatter.stringFromNumber(556)!)

显然，这仅适用于整数和英语语言环境。

NSNumberFormatter SpellOutStyle "and"

NSNumberFormatter SpellOutStyle with "and"

nsnumberformatter

ios

swift