iOS -去除float后面无效的0

使用subString去除float后面无效的0##

- (NSString *)changeFloatWithFloat:(CGFloat)floatValue
{
    return [self changeFloatWithString:[NSString stringWithFormat:@"%f",floatValue]];
}
- (NSString *)changeFloatWithString:(NSString *)stringFloat
{
    const char *floatChars = [stringFloat UTF8String];
    NSUInteger length = [stringFloat length];
    NSUInteger zeroLength = 0;
    NSInteger i = length-1;
    for(; i>=0; i--)
    {
        if(floatChars[i] == '0') {
            zeroLength++;
        } else {
            if(floatChars[i] == '.')
                i--;
            break;
        }
    }
    NSString *returnString;
    if(i == -1) {
        returnString = @"0";
    } else {
        returnString = [stringFloat substringToIndex:i+1];
    }
    return returnString;
}