IOS判断是否有效银行卡号

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+ (BOOL) isValidCreditNumber:(NSString*)value {    BOOL result = NO;    NSInteger length = [value length];    if (length >= 13) {        result = [WTCreditCard isValidNumber:value];        if (result)        {            NSInteger twoDigitBeginValue = [[value substringWithRange:NSMakeRange(0, 2)] integerValue];            //VISA            if([WTCreditCard isStartWith:value Str:@"4"]) {                if (13 == length||16 == length) {                    result = TRUE;                }else {                    result = NO;                }            }            //MasterCard            else if(twoDigitBeginValue >= 51 && twoDigitBeginValue <= 55 && length == 16) {                result = TRUE;            }            //American Express            else if(([WTCreditCard isStartWith:value Str:@"34"]||[WTCreditCard isStartWith:value Str:@"37"]) && length == 15){                result = TRUE;            }            //Discover            else if([WTCreditCard isStartWith:value Str:@"6011"] && length == 16) {                result = TRUE;            }else {                result = FALSE;            }        }        if (result)        {            NSInteger digitValue;            NSInteger checkSum = 0;            NSInteger index = 0;            NSInteger leftIndex;            //even length, odd index            if (0 == length%2) {                index = 0;                leftIndex = 1;            }            //odd length, even index            else {                index = 1;                leftIndex = 0;            }            while (index < length) {                digitValue = [[value substringWithRange:NSMakeRange(index, 1)] integerValue];                digitValue = digitValue*2;                if (digitValue >= 10)                {                    checkSum += digitValue/10 + digitValue%10;                }                else                {                    checkSum += digitValue;                }                digitValue = [[value substringWithRange:NSMakeRange(leftIndex, 1)] integerValue];                checkSum += digitValue;                index += 2;                leftIndex += 2;            }            result = (0 == checkSum%10) ? TRUE:FALSE;        }    }else {        result = NO;    }    return result;}
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