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@k-yamada-githubin株式会社ソニックス

NSDecimalNumberを切り捨て(floor)する

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Solution

func floorDecimal(number: NSDecimalNumber) -> NSDecimalNumber {
  let behavior = NSDecimalNumberHandler(roundingMode: .RoundDown, scale: 0, raiseOnExactness: false, raiseOnOverflow: false, raiseOnUnderflow: false, raiseOnDivideByZero: false)
  return number.decimalNumberByRoundingAccordingToBehavior(behavior)
}

floorDecimal(NSDecimalNumber(string: "55.55")) // => 55

参考

How to split a NSDecimalnumber between decimal & integer & back

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