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