NSNumberFormatter maximumFractionDigits and maximumSignificantDigits bug

Question

Is this a bug when using maximumFractionDigits and maximumSignificantDigits together on NSNumberForamtter on iOS 8?

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Answer 1

It isn't a bug. From the docs:

Note

When a number formatter is configured to use significant digits, it ignores any minimum or maximum values used to set integer or fraction digits.

https://developer.apple.com/documentation/foundation/nsnumberformatter/1417793-usessignificantdigits?language=objc

Note: If either maximumSignificantDigits or minimumSignificantDigits is set to any value, then usesSignificantDigits is automatically set to true. This contradicts the docs for maximumSignificantDigits and minimumSignificantDigits which says:

You must set the usesSignificantDigits property to true in order for this property to affect formatting behavior.

You don't need to set usesSignificantDigits to true, it will set itself to true.