金额字段加千位分隔符方法

- (NSString *)separatedDigitStringWithStr:(NSString *)digitString

{


/*
// 如果带两位小数
 NSString *endStr = [digitString substringFromIndex:digitString.length - 3];
    if (digitString.length - 3 <= 3) {
        
        return digitString;
        
    } else {
        
        NSMutableString *processString = [NSMutableString stringWithString:digitString];
        
        NSInteger location = processString.length - 3 - 3;
*/

    if (digitString.length <= 3) {
        
        return digitString;
        
    } else {
        
        NSMutableString *processString = [NSMutableString stringWithString:digitString];
   
        NSInteger location = processString.length - 3;
        
        NSMutableArray *processArray = [NSMutableArray array];
        
        while (location >= 0) {
            
            NSString *temp = [processString substringWithRange:NSMakeRange(location, 3)];
                        
            [processArray addObject:temp];
            
            if (location < 3 && location > 0)
                
            {
                
                NSString *t = [processString substringWithRange:NSMakeRange(0, location)];
                
                [processArray addObject:t];
                
            }
            
            location -= 3;
            
        }
        
        NSMutableArray *resultsArray = [NSMutableArray array];
        
        int k = 0;
        
        for (NSString *str in processArray)
            
        {
            
            k++;
            
            NSMutableString *tmp = [NSMutableString stringWithString:str];
            
            if (str.length > 2 && k < processArray.count )
                
            {
                
                [tmp insertString:@"," atIndex:0];
                
                [resultsArray addObject:tmp];
                
            } else {
                
                [resultsArray addObject:tmp];
                
            }
            
        }

        NSMutableString *resultString = [NSMutableString string];
        
        for (NSInteger i = resultsArray.count - 1 ; i >= 0; i--)
            
        {
            
            NSString *tmp = [resultsArray objectAtIndex:i];
            
            [resultString appendString:tmp];
            
        }
                
        return resultString;
        
    }
    
}