How/where do I use NSNumberFormatter?

问题

I'm new to code and after reviewing a few answers still need a hand with this.

In my code:

func labelInformation(){
     numLabels.text = newLabel.text
} 

Current result:

228500.23

Desired result:

228,500.23

How/where do I use NSNumberFormatter?

回答1:

Try like this:

let inputValue = 228500.23

let numberFormatter = NSNumberFormatter()

numberFormatter.numberStyle = .CurrencyStyle
numberFormatter.currencySymbol = ""

let outputString = numberFormatter.stringFromNumber(inputValue) ?? "0.00"

print(outputString)   // 228,500.23

来源：https://stackoverflow.com/questions/34360857/how-where-do-i-use-nsnumberformatter