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Editorial Team
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Asked: 2026-06-13T21:14:08+00:00

EDIT: Fixed, here is how i did it for furture reference: NSNumber *inputNumber =

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EDIT: Fixed, here is how i did it for furture reference:

NSNumber *inputNumber = [[NSNumber alloc ]initWithDouble:convertValue];
NSNumber *resultNumber = [[NSNumber alloc]initWithDouble:result];


NSNumberFormatter *formatterResult = [[NSNumberFormatter alloc] init];
formatterResult.numberStyle = NSNumberFormatterDecimalStyle;
NSNumberFormatter *formatterInput = [[NSNumberFormatter alloc] init];
formatterInput.numberStyle = NSNumberFormatterDecimalStyle;

[formatterResult setNumberStyle:NSNumberFormatterDecimalStyle];
[formatterResult setMaximumFractionDigits:6];

[formatterInput setNumberStyle:NSNumberFormatterDecimalStyle];
[formatterInput setMaximumFractionDigits:6];
//These four lines are the one fixing the issue. 


NSString *formattedResultString = [formatterResult stringFromNumber:(NSNumber*)resultNumber];
NSString *formattedInputString = [formatterInput stringFromNumber:(NSNumber*)inputNumber];






NSString *formelString = [[NSString alloc]initWithFormat:
                          @" %@ %@ =", formattedInputString, convertFromName];

formelLabel.text = formelString;


NSString *resultString = [[NSString alloc]initWithFormat:
                          @" %@ %@",formattedResultString, convertToName];

resultLabel.text = resultString;

———-ORIGINAL QUESTION————

So I have a problem with NSNumberFormatter shortening numbers too much, and also not displaying decimals when the main number is over 8 digits.

Problem described in following picture:

enter image description here <- Working, but shortening to three decimals. (And rounding up, which is done mathematically correct)

And then the problems: (Right-most picture is correct)

enter image description here
enter image description here
enter image description here

As you can see, the bottom image just ignores the decimals completely. What code do I need to add/change for this to work properly?

Here is the relevant code:

[super viewDidLoad];

    _convertFrom = @[@"MTPA", @"MMcf/day",
    @"Mill.Sm3/day", @"MMBTU/day", @"Boe/day",@"ton LNG/day", @"GJ/day"];

    _convertTo = @[@"MTPA", @"MMcf/day",
    @"Mill.Sm3/day", @"MMBTU/day", @"Boe/day", @"ton LNG/day", @"GJ/day"];

    _convertRates = @[ @1.0f, @133.3333333f, @3.775579545f,
    @137333.3333f, @23747.68013, @1716.17252, @147247.6022];
//some place down in the code:
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{

[self updateConversionLabel]; 
}


- (void)updateConversionLabel
{
float convertFrom = [[_convertRates objectAtIndex:[picker selectedRowInComponent:0]] floatValue];

float convertTo = [[_convertRates objectAtIndex:[picker selectedRowInComponent:1]] floatValue];

NSNumberFormatter *fmt = [NSNumberFormatter new];
float input = [fmt numberFromString:inputText.text].floatValue;

float to = convertTo;
float from = convertFrom;

float convertValue = input;
float relative = to / from;
float result = relative * convertValue;

NSString *convertFromName = [_convertFrom objectAtIndex:[picker selectedRowInComponent:0]];
NSString *convertToName = [_convertFrom objectAtIndex:[picker selectedRowInComponent:1]];


NSNumber *inputNumber = [[NSNumber alloc ]initWithFloat:convertValue];
NSNumber *resultNumber = [[NSNumber alloc]initWithFloat:result];


NSNumberFormatter *formatterResult = [[NSNumberFormatter alloc] init];
formatterResult.numberStyle = NSNumberFormatterDecimalStyle;
NSNumberFormatter *formatterInput = [[NSNumberFormatter alloc] init];
formatterInput.numberStyle = NSNumberFormatterDecimalStyle;

NSString *formattedResultString = [formatterResult stringFromNumber:(NSNumber*)resultNumber];
NSString *formattedInputString = [formatterInput stringFromNumber:(NSNumber*)inputNumber];





NSString *formelString = [[NSString alloc]initWithFormat:
                          @" %@ %@ =", formattedInputString, convertFromName];

formelLabel.text = formelString;


NSString *resultString = [[NSString alloc]initWithFormat:
                          @" %@ %@",formattedResultString, convertToName];
                          resultLabel.text = resultString;


}

I’d assume the problem/fix is in this code.

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1 Answer

  1. Editorial Team

    EDIT: Fixed, here is how I did it for future reference:

    NSNumber *inputNumber = [[NSNumber alloc ]initWithDouble:convertValue];
NSNumber *resultNumber = [[NSNumber alloc]initWithDouble:result];


NSNumberFormatter *formatterResult = [[NSNumberFormatter alloc] init];
formatterResult.numberStyle = NSNumberFormatterDecimalStyle;
NSNumberFormatter *formatterInput = [[NSNumberFormatter alloc] init];
formatterInput.numberStyle = NSNumberFormatterDecimalStyle;

[formatterResult setNumberStyle:NSNumberFormatterDecimalStyle];
[formatterResult setMaximumFractionDigits:6];

[formatterInput setNumberStyle:NSNumberFormatterDecimalStyle];
[formatterInput setMaximumFractionDigits:6];
//These four lines are the one fixing the issue. 


NSString *formattedResultString = [formatterResult stringFromNumber:    (NSNumber*)resultNumber];
NSString *formattedInputString = [formatterInput stringFromNumber:(NSNumber*)inputNumber];






NSString *formelString = [[NSString alloc]initWithFormat:
                      @" %@ %@ =", formattedInputString, convertFromName];

formelLabel.text = formelString;


NSString *resultString = [[NSString alloc]initWithFormat:
                      @" %@ %@",formattedResultString, convertToName];
resultLabel.text = resultString;
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