本博文想要解決的問題，是將一串阿拉伯數字(包含小數點)轉化為對應的大寫漢字。
實現思路如下：
1.將這串阿拉伯數字格式化，只取小數點後兩位；
2.將字串分割為整數部分的子串和小數部分的子串；
3.遍歷整數部分並拼接大寫漢字字串；
4.遍歷小數部分並拼接大寫漢字字串（需處理只有小數的情況）。

/*
例如 100 轉化為 一百元整
*/
+ (NSString *)convertAmount:(NSString *)amountString
{
    if (!amountString || ([amountString doubleValue] == [@"0.00" doubleValue]))
    {
        return
 
 @"零元整";
    }

    //首先轉化成標準格式        “200.23”
    NSString *doubleStr = nil;
    doubleStr = [NSString stringWithFormat:@"%.2f",[amountString doubleValue]];
    NSMutableString *tempStr= nil;
    tempStr = [[NSMutableString alloc] initWithString:doubleStr];
    //位
    NSArray *[email protected][@"元"
 
, @"拾", @"佰", @"仟", @"萬", @"拾", @"佰", @"仟", @"億", @"拾", @"佰", @"仟", @"兆", @"拾", @"佰", @"仟" ,@"京",@"十京",@"百京",@"千京垓",@"十垓",@"百垓",@"千垓秭",@"十秭",@"百秭",@"千秭穰",@"十穰",@"百穰",@"千穰"];
    NSArray *[email protected][@"分",@"角"];
    //數字
    NSArray *[email protected][@"零", @"壹", @"貳", @"叄", @"肆", @"伍", @"陸"
 
, @"柒", @"捌", @"玖"];

    NSArray *temarr = [tempStr componentsSeparatedByString:@"."];
    //小數點前的數值字串
    NSString *firstStr=[NSString stringWithFormat:@"%@",temarr[0]];
    //小數點後的數值字串
    NSString *secondStr=[NSString stringWithFormat:@"%@",temarr[1]];

    //是否拼接了“零”，做標記
    bool zero=NO;
    //拼接資料的可變字串
    NSMutableString *endStr= [[NSMutableString alloc] init];

    /**
     *  首先遍歷firstStr，從最高位往個位遍歷    高位----->個位
     */

    for(int i=(int)firstStr.length;i>0;i--)
    {
        //取最高位數
        NSInteger MyData=[[firstStr substringWithRange:NSMakeRange(firstStr.length-i, 1)]
                          integerValue];

        if ([numArr[MyData] isEqualToString:@"零"])
        {

            if ([carryArr1[i-1] isEqualToString:@"萬"]||[carryArr1[i-1] isEqualToString:@"億"]||[carryArr1[i-1] isEqualToString:@"元"]||[carryArr1[i-1] isEqualToString:@"兆"])
            {
                //去除有“零萬”
                if (zero)
                {
                    endStr =[NSMutableString stringWithFormat:@"%@",[endStr substringToIndex:(endStr.length-1)]];
                    [endStr appendString:carryArr1[i-1]];
                    zero=NO;
                }
                else
                {
                    [endStr appendString:carryArr1[i-1]];
                    zero=NO;
                }

                //去除有“億萬”、"兆萬"的情況
                if ([carryArr1[i-1] isEqualToString:@"萬"]) {
                    if ([[endStr substringWithRange:NSMakeRange(endStr.length-2, 1)] isEqualToString:@"億"]) {
                        endStr =[NSMutableString stringWithFormat:@"%@",[endStr substringToIndex:endStr.length-1]];
                    }

                    if ([[endStr substringWithRange:NSMakeRange(endStr.length-2, 1)] isEqualToString:@"兆"]) {
                        endStr =[NSMutableString stringWithFormat:@"%@",[endStr substringToIndex:endStr.length-1]];
                    }

                }
                //去除“兆億”
                if ([carryArr1[i-1] isEqualToString:@"億"]) {
                    if ([[endStr substringWithRange:NSMakeRange(endStr.length-2, 1)] isEqualToString:@"兆"]) {
                        endStr =[NSMutableString stringWithFormat:@"%@",[endStr substringToIndex:endStr.length-1]];
                    }
                }


            }else{
                if (!zero) {
                    [endStr appendString:numArr[MyData]];
                    zero=YES;
                }

            }

        }else{
            //拼接數字
            [endStr appendString:numArr[MyData]];
            //拼接位
            [endStr appendString:carryArr1[i-1]];
            //不為“零”
            zero=NO;
        }
    }

    /**
     *  再遍歷secondStr    角位----->分位
     */

    if ([secondStr isEqualToString:@"00"]) {
        [endStr appendString:@"整"];
    }else{
       //如果最後一位位0就把它去掉
        if (secondStr.length > 1 && [secondStr hasSuffix:@"0"])
        {
            secondStr = [secondStr substringToIndex：(secondStr.length - 1)];
        }

        for(int i=(int)secondStr.length;i>0;i--)
        {
            //取最高位數
            NSInteger MyData=[[secondStr substringWithRange:NSMakeRange(secondStr.length-i, 1)] integerValue];

            [endStr appendString:numArr[MyData]];
            [endStr appendString:carryArr2[i-1]];
        }
    }

    //add song
    if ([endStr hasPrefix:@"元"])
    {
        return  (NSString *)[endStr substringFromIndex:1];
    }

    return endStr;
}