ios numberformatter currency remove trailing decimals if 0

I want to format my number into a currency string. These are the following cases

25.00 => $25
25.43 => $25.43
25.4 => $25.40
0.00 -> $0

Is there a way to do this in NSNumberFormatter?

This is my code right now:

NSNumberFormatter *fmt = [[NSNumberFormatter alloc] init];
[fmt setNumberStyle:NSNumberFormatterCurrencyStyle];
[fmt setCurrencyCode:@"USD"];

However that fails for my first and last examples.

I also tried:

NSNumberFormatter *fmt = [[NSNumberFormatter alloc] init];
[fmt setPositiveFormat:@"$0.##"];

However that fails for my third case. Any suggestions?

I don't think there's a way to do this using a plain NSNumberFormatter. You could set the minimum and maximum fraction digits to 0 just for formatting integers in a subclass of NSNumberFormatter:

@interface MyCurrencyFormatter : NSNumberFormatter
@end

@implementation MyCurrencyFormatter

- (id)init {
    if ((self = [super init])) {
        [self setNumberStyle:NSNumberFormatterCurrencyStyle]];
        [self setCurrencyCode:@"USD"];
    }
    return self;
}

- (NSString *)stringFromNumber:(NSNumber *)aNumber {
    NSInteger minimumFractionDigits = [self minimumFractionDigits];
    NSInteger maximumFractionDigits = [self maximumFractionDigits];
    if ([self isInteger:aNumber]) {
        [self setMinimumFractionDigits:0];
        [self setMaximumFractionDigits:0];
    }
    NSString *formattedNumber = [super stringFromNumber:aNumber];
    [self setMinimumFractionDigits:minimumFractionDigits];
    [self setMaximumFractionDigits:maximumFractionDigits];
    return formattedNumber;
}

- (BOOL)isInteger:(NSNumber *)aNumber {
    NSDecimal decimalValue = aNumber.decimalValue;
    NSDecimalRound(&decimalValue, &decimalValue, 0, NSRoundDown);
    NSDecimalNumber *roundedValue = [[NSDecimalNumber alloc] initWithDecimal:decimalValue]
    return [aNumber isEqualToNumber:roundedValue];    
}

@end

This should handle international number formats as well.

Credit to this post for determining if a number is an integer.