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August 10, 2017 20:11
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Swift 3 String Extensions
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import Foundation | |
extension String | |
{ | |
/** | |
* Return formated currency string by locale with or not round | |
* @see https://developer.apple.com/documentation/foundation/numberformatter, https://developer.apple.com/documentation/foundation/numberformatter.style | |
* @return String if problem on format return string "" | |
*/ | |
func toCurrency(localeItendifier: String = "pt_BR", withRound: Bool = false) -> String{ | |
let numberFormatter: NumberFormatter = { | |
let formater = NumberFormatter() | |
formater.numberStyle = .currency | |
formater.locale = Locale(identifier: localeItendifier) | |
formater.alwaysShowsDecimalSeparator = true | |
formater.minimumFractionDigits = 2 | |
formater.maximumFractionDigits = 2 | |
return formater | |
}() | |
let valToFloat = Float(self)! | |
var val: NSNumber | |
if(withRound){ | |
val = NSNumber(value: round(valToFloat)) | |
} else { | |
val = NSNumber(value: valToFloat) | |
} | |
if let formmatedVal = numberFormatter.string(from: val){ | |
return formmatedVal | |
} | |
return "" | |
} | |
/** | |
* Shortcut replacingOccurrences | |
* @return String - string replaced | |
*/ | |
func replace(this: String, to: String) -> String | |
{ | |
return self.replacingOccurrences(of: this, with: to) | |
} | |
/** | |
* Remove all another char did not match with characterset decimalDigits | |
* @see https://developer.apple.com/documentation/foundation/characterset | |
* @return String - String decimals | |
*/ | |
func getDecimals() -> String | |
{ | |
return components(separatedBy: CharacterSet.decimalDigits.inverted).joined() | |
} | |
/** | |
* Verify if char is a utf8 backspace, util for testin keyboard keypress | |
* @see https://developer.apple.com/documentation/swift/string/1641523-init | |
* @see https://developer.apple.com/documentation/kernel/1579329-strcmp | |
* @return Bool - if a backspace char return true else false | |
*/ | |
func isBackSpace() -> Bool | |
{ | |
let char = self.cString(using: String.Encoding.utf8)! | |
let isBackSpace = strcmp(char, "\\b") | |
if(isBackSpace == -92){ return true } | |
return false | |
} | |
} |
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Usage
var compras = "R$1000.99"
var comprasnumero = "12300.92"
print(comprasnumero.toCurrency())
print(comprasnumero.toCurrency(localeItendifier: "pt_BR", withRound: true))
print(compras.replace(this: "R$", to: ""))
print(compras.getDecimals())
print(compras.isBackSpace())