Question

I realize there have been other questions like this, but my problem does not seem to relate accurately. Here’s the deal.

I have an app, that does a calculation. I am using floats for this. All floats work fine, and I convert the float value into a NSNumber for formatting.

NSNumberFormatter *numFormatter = [NSNumberFormatter alloc];
    [numFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
    [numFormatter setMinimumFractionDigits:1];
    [numFormatter setMaximumFractionDigits:5];

    NSNumber *insulinRatio = [NSNumber numberWithFloat:insulinRatioCalc];
    NSLog(@"Original Number = %@", insulinRatio);

My NSNumber, insulinRatio, has accurate precision. However, when I convert that into an NSString with NSNumberFormatter, it loses all decimal precision.

NSString *numberAsString = [numFormatter stringFromNumber:insulinRatio];
    NSLog(@"Number = %@", numberAsString);

My output for these last logs where the following:

2013-01-08 16:12:27.944 MyApp[84062:c07] Original Number = 1.2
2013-01-08 16:12:27.944 MyApp[84062:c07] Number = 1

Why am I losing this precision. I know that NSNumber converts to double, but the NSNumber is fine here. It is the NSNumberFormatter. What am I doing wrong?

Thanks

Answer 1

Nevermind. I just had to initialize NSNumberFormatter. #fail moment.

NSNumberFormatter *numFormatter = [[NSNumberFormatter alloc]init]; 

solved the problem. 🙂