NSNumberFormatter Currency Without Symbol?

问题

I am using NSNumberFormatter to get a currency value from a string and it works well.

I use this code to do so:

NSNumberFormatter *nf = [[NSNumberFormatter alloc] init];
    [nf setNumberStyle:NSNumberFormatterCurrencyStyle];
    NSString *price = [nf stringFromNumber:[NSNumber numberWithFloat:[textField.text floatValue]]];

However, it always gives me a currency symbol at the start of the string. Rather than doing it manually form my given string, can I not somehow have the formatter not give the string any currency symbol?

回答1:

Yes, after you set the style, you can tweak specific aspects:

NSNumberFormatter *nf = [[NSNumberFormatter alloc] init];
[nf setNumberStyle:NSNumberFormatterCurrencyStyle];
[nf setCurrencySymbol:@""]; // <-- this
NSDecimalNumber* number = [NSDecimalNumber decimalNumberWithString:[textField text]];
NSString *price = [nf stringFromNumber:number];

Just as some advice, you should probably use a number formatter to read the string value, especially if a user is entering it (as suggested by your code). In this case, if the user enters locale-specific formatting text, the generic -floatValue and -doubleValue type methods won't give you truncated numbers. Also, you should probably use -doubleValue to convert to a floating point number from user-entered text that's a currency. There's more information about this in the WWDC'12 developer session video on internationalization.

Edit: Used an NSDecimalNumber in the example code to represent the number the user enters. It's still not doing proper validation, but better than the original code. Thanks @Mark!

回答2:

With Swift 5, NumberFormatter has a property called currencySymbol. currencySymbol has the following declaration:

var currencySymbol: String! { get set }

The string used by the receiver as a local currency symbol.

Therefore, if required for your formatting style, you can set this property to an empty String.

---

The following Playground sample code shows how to set your currency formatting style with an empty symbol:

import Foundation

let amount = 12000

let formatter = NumberFormatter()
formatter.numberStyle = NumberFormatter.Style.currency
formatter.currencySymbol = ""
formatter.locale = Locale(identifier: "en_US") // set only if necessary

let result = formatter.string(for: amount)
print(String(describing: result)) // prints: Optional("12,000.00")

回答3:

as for Swift Language

let mymoney = 12000

let formatter = NSNumberFormatter()
formatter.numberStyle = .CurrencyStyle
formatter.currencySymbol = ""
formatter.locale = NSLocale.currentLocale()

let resultString = formatter.stringFromNumber(mymoney)!

回答4:

A little tweak to @Imanou Petit answer.

let myDouble = 9999.99
let currencyFormatter = NumberFormatter()
currencyFormatter.usesGroupingSeparator = true
currencyFormatter.numberStyle = .currency
currencyFormatter.currencySymbol = ""
// localize to your grouping and decimal separator
currencyFormatter.locale = Locale.current

// We'll force unwrap with the !, if you've got defined data you may need more error checking

let priceString = currencyFormatter.string(from: NSNumber(value: myDouble))!
print(priceString) // Displays 9,999.99 without the currency & not as Optional

来源：https://stackoverflow.com/questions/12522436/nsnumberformatter-currency-without-symbol