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UILabelで金額(例:¥1,003)を表示したい

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危うくStringの足し算するところでした。。
Swiftになる前からNSNumberFormatterという便利なクラスがあったんですねー。

下記のようにすればOK

金額をイイカンジに表示するヤツ.swift
var formatter = NSNumberFormatter()
formatter.numberStyle = .CurrencyStyle

let price = 1003

priceLabel.text = formatter.stringFromNumber(price)
// きっと¥1,003と表示されます。私はされました。

NSNumberFormatterインスタンスで3桁毎に,を追加する方法でも良いです。
.CurrencyStyleだと¥を金額のアタマに付けてくれて助かるし、私はこちらで。

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