mastodon-app-ufficiale-ipho.../MastodonSDK/Sources/MastodonUI/Helper/MastodonMetricFormatter.swift

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//
// MastodonMetricFormatter.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-4-2.
//
import Foundation
public final class MastodonMetricFormatter: Formatter {
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public func string(from number: Int) -> String? {
let isPositive = number >= 0
let symbol = isPositive ? "" : "-"
let numberFormatter = NumberFormatter()
let value = abs(number)
let metric: String
switch value {
case 0..<1000: // 0 ~ 1K
metric = String(value)
case 1000..<10000: // 1K ~ 10K
numberFormatter.maximumFractionDigits = 1
let string = numberFormatter.string(from: NSNumber(value: Double(value) / 1000.0)) ?? String(value / 1000)
metric = string + "K"
case 10000..<1000000: // 10K ~ 1M
numberFormatter.maximumFractionDigits = 0
let string = numberFormatter.string(from: NSNumber(value: Double(value) / 1000.0)) ?? String(value / 1000)
metric = string + "K"
default:
numberFormatter.maximumFractionDigits = 0
let string = numberFormatter.string(from: NSNumber(value: Double(value) / 1000000.0)) ?? String(value / 1000000)
metric = string + "M"
}
return symbol + metric
}
}