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Преобразование чисел в удобочитаемый формат, добавляя соответствующие постфиксы для больших чисел (например, 123 тысяч, 5 миллионов, 8 миллиардов и т.д.).
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| public extension Double { | |
| func humanFormatted( | |
| groupingSeparator: String = " ", | |
| roundingMode: NumberFormatter.RoundingMode = .halfEven, | |
| fractionDigits: Int = 1, | |
| threshold: Double = 9_999 | |
| ) -> (stringValue: String, postfix: String?) { | |
| let dividerNames: [String?] = [nil, "тыс.", "млн", "млрд", "трлн", "квадрлн"] | |
| var index = 0 | |
| var humanValue = self | |
| while abs(humanValue) > threshold { | |
| humanValue /= 1_000 | |
| index += 1 | |
| } | |
| let formatter = NumberFormatter() | |
| let number = NSNumber(value: humanValue) | |
| formatter.roundingMode = roundingMode | |
| formatter.minimumFractionDigits = 0 | |
| formatter.maximumFractionDigits = fractionDigits | |
| formatter.groupingSeparator = groupingSeparator | |
| formatter.numberStyle = .decimal | |
| let stringValue = formatter.string(from: number)?.replacingOccurrences(of: ".", with: ",") ?? "" | |
| return ( | |
| stringValue: stringValue, | |
| postfix: index < dividerNames.count ? dividerNames[index] : nil | |
| ) | |
| } | |
| } |
7 видов NumberFormatter.RoundingMode:
Пример для понимания:
import Foundation
let numberFormatter = NumberFormatter()
let number = -1.45
let number2 = 1.45
numberFormatter.maximumFractionDigits = 1
// Округляем от нуля
numberFormatter.roundingMode = .up
print("up")
print(numberFormatter.string(for: number)) // -1.5
print(numberFormatter.string(for: number2)) // 1.5
// Округляем в сторону нуля
numberFormatter.roundingMode = .down
print("\ndown")
print(numberFormatter.string(for: number)) // -1.4
print(numberFormatter.string(for: number2)) // 1.4
// Округление в сторону положительной бесконечности
numberFormatter.roundingMode = .ceiling
print("\nceiling")
print(numberFormatter.string(for: number)) // -1.4
print(numberFormatter.string(for: number2)) // 1.5
// Округляем в сторону минус бесконечности
numberFormatter.roundingMode = .floor
print("\nfloor")
print(numberFormatter.string(for: number)) // -1.5
print(numberFormatter.string(for: number2)) // 1.4
// Округлите в сторону ближайшего целого числа или если оно равноудалено, то от нуля
numberFormatter.roundingMode = .halfUp
print("\nhalfUp")
print(numberFormatter.string(for: number)) // -1.5
print(numberFormatter.string(for: number2)) // 1.5
// Округлите в сторону ближайшего целого числа или если оно равноудалено, то к нулю
numberFormatter.roundingMode = .halfDown
print("\nhalfDown")
print(numberFormatter.string(for: number)) // -1.4
print(numberFormatter.string(for: number2)) // 1.4
// Округлите в сторону ближайшего целого числа или если оно равноудалено, то в сторону четного числа
numberFormatter.roundingMode = .halfEven
print("\nhalfEven")
print(numberFormatter.string(for: number)) // -1.4
print(numberFormatter.string(for: number2)) // 1.4
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Usage: