iOS开发:金额转大写

直接上代码：这是NSString的类别

//数字金额转大写
-(NSString *)changetochinese
{
    if (self.length == 0) {
        return @"";
    }
    
    double numberals=[self doubleValue];
    
    NSArray *numberchar = @[@"零",@"壹",@"贰",@"叁",@"肆",@"伍",@"陆",@"柒",@"捌",@"玖"];
    
    NSArray *inunitchar = @[@"",@"拾",@"佰",@"仟"];
    
    NSArray *unitname = @[@"",@"万",@"亿",@"万亿"];
    
    //金额乘以100转换成字符串（去除圆角分数值）
    
    NSString *valstr=[NSString stringWithFormat:@"%.2f",numberals];
    
    NSString *prefix;
    
    NSString *suffix;
    
    if (valstr.length<=2) {
        
        prefix=@"零元";
        
        if (valstr.length==0) {
            
            suffix=@"零角零分";
            
        }
        
        else if (valstr.length==1)
            
        {
            
            suffix=[NSString stringWithFormat:@"%@分",[numberchar objectAtIndex:[valstr intValue]]];
            
        }
        
        else
            
        {
            
            NSString *head=[valstr substringToIndex:1];
            
            NSString *foot=[valstr substringFromIndex:1];
            
            suffix=[NSString stringWithFormat:@"%@角%@分",[numberchar objectAtIndex:[head intValue]],[numberchar objectAtIndex:[foot intValue]]];
            
        }
        
    }
    
    else
        
    {
        
        prefix=@"";
        
        suffix=@"";
        
        NSInteger flag=valstr.length-2;
        
        NSString *head=[valstr substringToIndex:flag-1];
        
        NSString *foot=[valstr substringFromIndex:flag];
        
        if (head.length>13) {
            
            return@"数值太大（最大支持13位整数），无法处理";
            
        }
        if ([head isEqualToString:@"0"]) {
            
        }else {
            //处理整数部分
            
            NSMutableArray *ch=[[NSMutableArray alloc]init];
            
            for (int i = 0; i < head.length; i++) {
                
                NSString * str=[NSString stringWithFormat:@"%x",[head characterAtIndex:i]-'0'];
                
                [ch addObject:str];
                
            }
            
            int zeronum=0;
            
            
            
            for (int i=0; i