判断银行账号是否输入正确

2015-4-8 16:36 956 0

摘要: [objc] view plaincopy不多说直接贴代码随便输入银行卡号就可以进行判断 [objc] view pl...

关键词： nbsp tmpVal cardNoLength nil cardNo int evensum UIAlertView oddsum allsum

[objc] view plaincopy不多说直接贴代码随便输入银行卡号就可以进行判断 [objc] view plaincopy- (void)viewDidLoad { [super viewDidLoad]; NSString *str = @"6226820011200783033"; BOOL isRight = [self checkCardNo:str]; if (!isRight) { UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"不对" message:@"请重新输入卡号" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil, nil nil]; [alert show]; }else{ UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"对" message:@"" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil, nil nil]; [alert show];} } //这就是判断方法 [objc] view plaincopy- (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; }

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