(Swift) NumberFormatter 정수 / 소수 자릿수 정하기

• minimumFractionDigits
  : 최소 소수점 자릿수 

// 1
var numberFormatter = NumberFormatter()
numberFormatter.minimumFractionDigits = 0 // default
numberFormatter.string(from: 123.456) // 123

numberFormatter.minimumFractionDigits = 5
numberFormatter.string(from: 123.456) // 123.45600


// 2
var priceString = 123456789
func convertToCurrencyFormat(price: Int) -> String {
    numberFormatter.numberStyle = .decimal // 십진수 
	numberFormatter.minimumFractionDigits = 0
    return numberFormatter.string(from: NSNumber(value: price))!
}

converToCurrencyFormat(priceString) // 123,456,789

 

 

• maximumFractionDigits
  : 최대 소수점 자릿수

var NumberFormatter = NumberFormatter()
numberFormatter.maximumFractionDigits = 0 // default
numberFormatter.string(from: 123.456) // 123

numberFormatter.maximumFractionDigits = 3
numberFormatter.string(from: 123.456789) // 123.456

 

 

• minimumIntegerDigits
  : 최소 정수 자릿수

var numberFormatter = NumberFormatter()
numberFormatter.minimumIntegerDigits = 0 // default
numberFormatter.string(from: 123) // 123

numberFormatter.minimumIntegerDigits = 5
numberFormatter.string(from: 123) // 00123

 

 

• maximumIntegerDigits
  : 최대 정수 자릿수

var numberFormatter = NumberFormatter
numberFormatter.maximumIntegerDigits = 42 // default
numberFormatter.string(from: 12345) // 12345

numberFormatter.maximumIntegerDigits = 3
numberFormatter.string(from: 12345) // 345

 

 

 

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NumberFormatter

https://developer.apple.com/documentation/foundation/numberformatter

NumberFormatter | Apple Developer Documentation

minimumFractionDigits

https://developer.apple.com/documentation/foundation/numberformatter/1410459-minimumfractiondigits

minimumFractionDigits | Apple Developer Documentation