CODEWITHSUNDEEP
cocoa-touchcocoansnumbernsnumberformatter
Abraham Vegh
Abraham Vegh

Reputation: 1490

How can I configure NSNumberFormatter to display a decimal part without leading zeros?

I’m using NSNumberFormatter to format an NSDecimalNumber.

What configuration can I use to display the number 0.012676 as 1?

Important: I am not trying to round up to 1.0 — I’m trying to round to the hundred place in the decimal, and then strip the preceding zeros and decimal separator.

My current configuration looks something like this:

// in a method...

NSDecimalNumber *value = /* retrieve a value like 0.012676 */;
NSNumberFormatter *nf = [[NSNumberFormatter alloc] init];

// this is the rounding behavior I want
[nf setRoundingMode: NSNumberFormatterRoundHalfEven];

[nf setMinimumFractionDigits: 2];
[nf setMaximumFractionDigits: 2];

return [nf stringFromNumber: value];

which generates an output of:

.01

With thanks to dasblinkenlight and Twitter friends, the solution is simply to multiply by 100, and then eliminate the fraction digits:

[nf setMultiplier: [NSNumber numberWithInt: 100]];
[nf setMinimumFractionDigits: 0];
[nf setMaximumFractionDigits: 0];

Upvotes: 2

Views: 455

Answers (1)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726489

You can eliminate N leading zeros by multiplying by the N-th power of ten. Since you are looking for the hundredth place, multiply 0.012676 by 100, and convert it to an integer.

Upvotes: 2

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