NSNumberFormatter leading 0 and decimal places

Question

Is there a way to format NSNumber with leading 0 and decimal places? For example, I need to be able to write 4.5, as well as 000. I currently have it, where it will give decimals, but it does not lead 0.

NSNumberFormatter *f = [[NSNumberFormatter alloc] init]; f.numberStyle = NSNumberFormatterNoStyle; NSString *myString = [f numberFromString:@"4.5"]; NSLog(@"myString: %@",myString); NSString *myOtherString = [f numberFromString:@"000"]; NSLog(@"myOtherString:%@",myOtherString); 

The output above is "myString: 4.5" and "myOtherString: 0". I need to be able to do both "4.5" and "000" as output.

I watched the "Apple Data Formatting Guide" without much success.

Answer 1

Note that [f numberFromString:@"4.5"] returns NSNumber* not a NSString*

You want something like this:

 NSNumberFormatter *f = [[NSNumberFormatter alloc] init]; f.numberStyle = NSNumberFormatterNoStyle; NSNumber *myNumber; NSString *myString; myNumber = [f numberFromString:@"4.5"]; [f setNumberStyle:kCFNumberFormatterDecimalStyle]; myString = [f stringFromNumber:myNumber]; NSLog(@"myString: %@",myString); myNumber = [f numberFromString:@"000"]; // Note that the extra zeros are useless [f setFormatWidth:3]; [f setPaddingCharacter:@"0"]; myString = [f stringFromNumber:myNumber]; NSLog(@"myString: %@",myString); 

NSLog Output:

myString: 4.5
myString: 000

If you do not have lines to start, just create a number, for example:

 myNumber = [NSNumber numberWithFloat:4.5]; myNumber = [NSNumber numberWithInt:0]; 

Or just use standard formatting:

 myString = [NSString stringWithFormat:@"%.1f", [myNumber floatValue]]; myString = [NSString stringWithFormat:@"%03d", [myNumber intValue]]; 

Or, if you do not need an NSNumber , just use standard formatting:

 myString = [NSString stringWithFormat:@"%.1f", 4.5]; myString = [NSString stringWithFormat:@"%03d", 0]; 

Answer 2

You can try something like:

 NSString *myString = [NSString stringWithFormat:@"%03f", [myNSNumber floatValue]]; 

This, following printf , will print your number, forcing you to print at least 3 digits and filling in "0 any empty space."

Answer 3

How about this as a variation of the theme for 000

  NSNumber *myNumber; NSString *myString =@ "000" ; NSString * myStringResult; NSNumberFormatter *f = [[NSNumberFormatter alloc] init]; f.numberStyle = NSNumberFormatterNoStyle; [f setHasThousandSeparators:FALSE]; //-- remove seperator [f setMinimumIntegerDigits:[myString length ]]; //-- set minimum number of digits to display using the string length. myNumber = [f numberFromString:myString]; myStringResult = [f stringFromNumber:myNumber]; NSLog(@"myStringResult: %@",myStringResult); 

Answer 4

Since it is often asked questions, and Apple docs suck, this is the answer that people will look for. The link below has two solutions. One uses an NSString stringWithFormat: and the other NSNumberFormatter .

fooobar.com/questions/531143 / ...