下面小编就为大家带来一篇判断用户输入的银行卡号是否正确的方法(基于Luhn算法的格式校验)。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧
开发中,有时候,为了打造更好的用户体验,同时减轻服务器端的压力,需要对于一些如,手机号码,银行卡号,身份证号码进行格式校验
下面是判断银行卡号输入是否正确的代码(基于Luhn算法的格式校验):
iOS代码:
/** * 银行卡格式校验 * * @param cardNo 银行卡号 * * @return */ + (BOOL) checkCardNo:(NSString*) cardNo{ int oddsum = 0; //奇数求和 int evensum = 0; //偶数求和 int allsum = 0; int cardNoLength = (int)[cardNo length]; int lastNum = [[cardNo substringFromIndex:cardNoLength-1] intValue]; cardNo = [cardNo substringToIndex:cardNoLength - 1]; for (int i = cardNoLength -1 ; i>=1;i--) { NSString *tmpString = [cardNo substringWithRange:NSMakeRange(i-1, 1)]; int tmpVal = [tmpString intValue]; if (cardNoLength % 2 ==1 ) { if((i % 2) == 0){ tmpVal *= 2; if(tmpVal>=10) tmpVal -= 9; evensum += tmpVal; }else{ oddsum += tmpVal; } }else{ if((i % 2) == 1){ tmpVal *= 2; if(tmpVal>=10) tmpVal -= 9; evensum += tmpVal; }else{ oddsum += tmpVal; } } } allsum = oddsum + evensum; allsum += lastNum; if((allsum % 10) == 0) return YES; else return NO; }
Androd代码:
/** * 匹配Luhn算法:可用于检测银行卡卡号 * @param cardNo * @return */ public static boolean matchLuhn(String cardNo) { int[] cardNoArr = new int[cardNo.length()]; for (int i=0; i<cardNo.length(); i++) { cardNoArr[i] = Integer.valueOf(String.valueOf(cardNo.charAt(i))); } for(int i=cardNoArr.length-2;i>=0;i-=2) { cardNoArr[i] <<= 1; cardNoArr[i] = cardNoArr[i]/10 + cardNoArr[i]%10; } int sum = 0; for(int i=0;i<cardNoArr.length;i++) { sum += cardNoArr[i]; } return sum % 10 == 0; }
附(银行卡号格式化):
在输入银行卡号过程中,通常,我们会每隔4位插入一个"-",类似"1332-2131-2313-1231-212"这种的格式
可以通过以下方法实现:
设置textField的代理
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSString *text = [textField text]; NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789\b"]; string = [string stringByReplacingOccurrencesOfString:@"-" withString:@""]; if ([string rangeOfCharacterFromSet:[characterSet invertedSet]].location != NSNotFound) { return NO; } text = [text stringByReplacingCharactersInRange:range withString:string]; text = [text stringByReplacingOccurrencesOfString:@"-" withString:@""]; NSString *newString = @""; while (text.length > 0) { NSString *subString = [text substringToIndex:MIN(text.length, 4)]; newString = [newString stringByAppendingString:subString]; if (subString.length == 4) { newString = [newString stringByAppendingString:@"-"]; } text = [text substringFromIndex:MIN(text.length, 4)]; } newString = [newString stringByTrimmingCharactersInSet:[characterSet invertedSet]]; if (newString.length >= 24) { return NO; } [textField setText:newString]; return NO; }
最后,怎么获得不包含符号"-"的银行卡号呢?
[self.textField.text stringByReplacingOccurrencesOfString:@"-" withString:@""]
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