Formatting double values ignoring leading zeros in fraction part-CodePudding

I want to format the fraction part of double values with 5 digits by ignoring the leading zeros, for example:

0.123456 -> 0.12345

0.00001234567 -> 0.000012345

0.0001234567 -> 0.00012345

how can I do that?

I tried to set the maximum and minimum fraction digits with the number formatter but it didn't give me the result I wanted.

CodePudding user response：

You could try to do that with a regular expression:

^\d \.(0*)\d{1,5}

Result:

0.00001234567 => 0.000012345
3.7 => 3.7
1.00523 => 1.00523
2.00287638723687263 => 2.0028763

CodePudding user response：

You can use usesSignificantDigits with maximumSignificantDigits from NSNumberFormatter.

let nf = NSNumberFormatter()
nf.usesSignificantDigits = true
nf.maximumSignificantDigits = 5

Should do the trick