判断银行卡号是否有效
+ (BOOL) isValidCreditNumber:(NSString*)value { 02.
BOOL result = NO;
03.
NSInteger length = [value length];
04.
if (length >= 13) { 05.
result = [WTCreditCard isValidNumber:value];
06.
if (result) 07.
{ 08.
NSInteger twoDigitBeginValue = https://www.it610.com/article/[[value substringWithRange:NSMakeRange(0, 2)] integerValue];
09.
//VISA 10.
if([WTCreditCard isStartWith:value Str:@"4"]) { 11.
if (13 == length||16 == length) { 12.
result = TRUE;
13.
}else { 14.
result = NO;
15.
} 16.
} 17.
//MasterCard 18.
else if(twoDigitBeginValue >= 51 && twoDigitBeginValue <= 55 && length == 16) { 19.
result = TRUE;
20.
} 21.
//American Express 22.
else if(([WTCreditCard isStartWith:value Str:@"34"]||[WTCreditCard isStartWith:value Str:@"37"]) && length == 15){ 23.
result = TRUE;
24.
} 25.
//Discover 26.
else if([WTCreditCard isStartWith:value Str:@"6011"] && length == 16) { 27.
result = TRUE;
28.
}else { 29.
result = FALSE;
30.
} 31.
} 32.
if (result) 33.
{ 34.
NSInteger digitValue;
35.
NSInteger checkSum = 0;
36.
NSInteger index = 0;
37.
NSInteger leftIndex;
38.
//even length, odd index 39.
if (0 == length%2) { 40.
index = 0;
41.
leftIndex = 1;
42.
} 43.
//odd length, even index 44.
else { 45.
index = 1;
46.
leftIndex = 0;
47.
} 48.
while (index < length) { 49.
digitValue = https://www.it610.com/article/[[value substringWithRange:NSMakeRange(index, 1)] integerValue];
50.
digitValue = https://www.it610.com/article/digitValue*2;
51.
if (digitValue >= 10) 52.
{ 53.
checkSum += digitValue/10 + digitValue%10;
54.
} 55.
else 56.
{ 57.
checkSum += digitValue;
58.
} 59.
digitValue = https://www.it610.com/article/[[value substringWithRange:NSMakeRange(leftIndex, 1)] integerValue];
60.
checkSum += digitValue;
61.
index += 2;
62.
leftIndex += 2;
63.
} 64.
result = (0 == checkSum%10) ? TRUE:FALSE;
65.
} 66.
}else { 67.
result = NO;
68.
} 69.
return result;
70.
}
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