Leading zeros for float in Swift

Question

Here are some float value:

5.3
23.67
0.23

and I want them to be

05.30
23.67
00.23

Using String(format: "%.2f", floatVar) can make 2 digit following the decimal point but cannot add zero before it.

I've also tried String(format: "%04.2f", floatVar) as suggest here but it just display same as %.2f

Is there a clean way of doing this within the Swift standard libraries?

Answer 1

If you want a quick and dirty solution:

String(format: "%05.2f", floatChar)

From this documentation: 0 means pad it with leading zero. 5 is the minimum width, including the dot character.

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The longer answer is that some locales use comma as the decimal separator. If you want to match the user's locale, use NumberFormatter:

let formatter = NumberFormatter()
formatter.minimumFractionDigits = 2
formatter.maximumFractionDigits = 2
formatter.minimumIntegerDigits = 2

formatter.string(from: NSNumber(value: floatChar))!