iPhone Sdk中的信用卡validation算法

任何人都可以分享信用卡validation算法的任何示例代码。

Answer 1

Luhn算法：

http://en.wikipedia.org/wiki/Luhn_algorithm

这里有一些常用语言的示例：

http://rosettacode.org/wiki/Luhn_test_of_credit_card_numbers

从这个链接，大多数CC使用Luhn（见表）：

http://en.wikipedia.org/wiki/Credit_card_number

从上面的链接（rosettacode）：

- (NSMutableArray *) toCharArray { NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[self length]]; for (int i=0; i < [self length]; i++) { NSString *ichar = [NSString stringWithFormat:@"%c", [self characterAtIndex:i]]; [characters addObject:ichar]; } return [characters autorelease]; } + (BOOL) luhnCheck:(NSString *)stringToTest { NSMutableArray *stringAsChars = [stringToTest toCharArray]; BOOL isOdd = YES; int oddSum = 0; int evenSum = 0; for (int i = [stringToTest length] - 1; i >= 0; i--) { int digit = [(NSString *)[stringAsChars objectAtIndex:i] intValue]; if (isOdd) oddSum += digit; else evenSum += digit/5 + (2*digit) % 10; isOdd = !isOdd; } return ((oddSum + evenSum) % 10 == 0); } // results BOOL test0 = [self luhnCheck:@"49927398716"]; //Result = YES BOOL test1 = [self luhnCheck:@"49927398717"]; //Result = NO BOOL test2 = [self luhnCheck:@"1234567812345678"]; //Result = NO BOOL test3 = [self luhnCheck:@"1234567812345670"]; //Result = YES 

Answer 2

在您的应用程序中，您只能进行信用卡号validation而不是validation（银行必须这样做）。 请参考这个正则表达式网站 。

Answer 3

 -(void)validation_check:(NSString*)pass_value { NSMutableArray *character; unsigned long long odd_no; unsigned long long new_odd_no; unsigned long long even_no; unsigned long long new_even_no; unsigned long long multiplied_even_no; unsigned long long changed_even_no; unsigned long long final_value; unsigned long long revers_card_no; unsigned long long card_no; unsigned long long check_reverse; new_odd_no = 0; new_even_no = 0; card_no = [pass_value longLongValue]; character = [[NSMutableArray alloc]init]; //-------reversing order of entered card number--------- for(int i = 0; i<[pass_value length];i++) { check_reverse =(card_no % 10); card_no = (card_no / 10); [character addObject:[NSString stringWithFormat:@"%qu",check_reverse]]; revers_card_no=revers_card_no*10+check_reverse; check_reverse=card_no; } pass_value = [NSString stringWithFormat:@"%qu",revers_card_no]; //--------checking for even and odd numbers-------- for(int j=0;j<[character count];j++) { if(j % 2 == 0) { odd_no = [[character objectAtIndex:j]longLongValue]; new_odd_no = new_odd_no+odd_no; } else { //------doubling the value of even no's-------- even_no = [[character objectAtIndex:j]longLongValue]; multiplied_even_no=even_no*2; NSLog(@"%qu",multiplied_even_no); //-------if even is a single digit-------- if((multiplied_even_no % 10) == 0) { if(multiplied_even_no == 10) { new_even_no = 1+new_even_no; } else { new_even_no = multiplied_even_no + new_even_no; } } //----------if there is multiple digits in even no--------- else { int x=(multiplied_even_no % 10); int y=multiplied_even_no /10; changed_even_no = x+y; new_even_no = new_even_no + changed_even_no; } } } //--------calculating final value-------- final_value = new_even_no + new_odd_no; NSLog(@"%qu",final_value); if((final_value % 10) == 0) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"Card No is valid" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; card_textField.text=nil; } else { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"Card No is not valid" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Try again" ,nil]; [alert show]; card_textField.text=nil; } }