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Different currencies have different standards for minor unit (ISO 4217: https://www.iso.org/iso-4217-currency-codes.html). e.g. USD minor units are displayed with two decimal places. JPY doesn’t have a minor unit. The solution is to store the value in minor units and make it client’s responsibility to do the conversion.
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| import Foundation | |
| let value = 10000 // Value stored in the database along with the currency code | |
| let numberFormatter = NumberFormatter() | |
| numberFormatter.numberStyle = .currency | |
| numberFormatter.currencyCode = "USD" | |
| print("\(Double(value)/pow(10, Double(numberFormatter.maximumFractionDigits)))") // 100.0 | |
| numberFormatter.currencyCode = "JPY" | |
| print("\(Double(value)/pow(10, Double(numberFormatter.maximumFractionDigits)))") // 10000.0 |
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