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判断银行卡号是否有效

2016-09-13 14:58 204 查看 
+ (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 = [[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 = [[value substringWithRange:NSMakeRange(index,
1
)] integerValue];

50.
digitValue = digitValue*
2
;

51.
if

(digitValue >=
10
)

52.
{

53.
checkSum += digitValue/
10

+ digitValue%
10
;

54.
}

55.
else

56.
{

57.
checkSum += digitValue;

58.
}

59.
digitValue = [[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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