CODEWITHSUNDEEP
iosnsnumberformatter
Asatur Galstyan
Asatur Galstyan

Reputation: 424

NSNumberFormatter positiveFormat

I need to format decimal numbers using NSNumberFormatter. The result needs to be as follow

7 => 7

7.1 => 7.10

so if number have decimal part show it with 2 decimals.

I've tried with maximumFractionDigits = 2 and positiveFormat = @"###0.00" but it's not giving result I'm expecting

7 => 7.00

7.1 => 7.10

What is best positiveFormat to achieve my result?

here is code I'm using

NSNumberFormatter *numberFormatter = [NSNumberFormatter new];
numberFormatter.minimumFractionDigits = 0;
numberFormatter.maximumFractionDigits = 2;
numberFormatter.positiveFormat = @"###0.00";

My solution 

if ([number doubleValue] == [number integerValue]) {
    // use formatter with minimumFractionDigits = 0 and maximumFractionDigits = 0
} else {
    // use formatter with minimumFractionDigits = 2 and maximumFractionDigits = 2
}

Upvotes: 3

Views: 1411

Answers (1)

Wladek Surala
Wladek Surala

Reputation: 2629

There is no way to achieve that by setting properties of NSNumberFormatter. You can achieve that in two ways:

First way:

subclass NSNumberFormatter and implement it's stringFromNumber: method (or any related that you use for formatting. Then you set manually both minimumFractionDigits and maximumFractionDigits before formatting, like this (pseudocode) in stringFromNumber override, "numberHasDecimalFraction" is boolean condition you have to implement:

if(numberHasDecimalFraction){
    self.minimumFractionDigits = 2;
    self.maximumFractionDigits = 2;
}else{
    self.minimumFractionDigits = 0;
    self.maximumFractionDigits = 0;
}

return [super stringFromNumber: number];

Second way:

Create a wrapper around two formatters and use it to format falling back on one of them depending on condition of having fraction digits similar to what you have in first way.

Upvotes: 1

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