iOS根据卡号自动识别银行

公司项目需求根据用户输入的卡号自动识别是哪家银行，一般都是根据卡号的前六位进行判断，因此在网上找了个demo进行了一些改动，下面是实现的具体代码。

[原文链接] http://www.jianshu.com/p/47ba8bd5aee3

#pragma mark --UITextFieldDelegate

//输入时一直监听,返回YES表示修改生效,返回NO表示不修改

- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string {

if(textField.tag== 1) {

return YES;

}

NSString*text = [self.cardNumTextFieldtext];

//返回一个字符集,指定字符串中包含的字符

NSCharacterSet*characterSet = [NSCharacterSetcharacterSetWithCharactersInString:@"0123456789\b"];

//string = [string stringByReplacingOccurrencesOfString:@" " withString:@""];

//invertedSet除了characterSet中包含的字符都找出来

if([stringrangeOfCharacterFromSet:[characterSetinvertedSet]].location != NSNotFound) {

return NO;

}

text = [text stringByReplacingCharactersInRange:rangewithString:string];

text = [text stringByReplacingOccurrencesOfString:@" "withString:@""];

//不能写nil,nil是空指针，但@“”不是空指针，nil会造成无法添加字符串

NSString*newString = @"";

while(text.length > 0) {

//每4位截取/不够4位有多少截取多少

NSString*subString = [text substringToIndex:MIN(text.length, 4)];

newString = [newString stringByAppendingString:subString];

//加空格

if(subString.length == 4) {

newString = [newString stringByAppendingString:@" "];

}

text = [text substringFromIndex:MIN(text.length, 4)];

}

newString = [newString stringByTrimmingCharactersInSet:[characterSet invertedSet]];

//限制长度

if(newString.length >= 24) {

return NO;

}

[self.cardNumTextField setText:newString];

NSString*originalStr = [newString stringByReplacingOccurrencesOfString:@" "withString:@""];

//判断实哪家银行,并赋值

if([self returnBankName:originalStr].length > 0) {

self.bankName.text= [self returnBankName:originalStr];

}

//小于6位清空

if(self.cardNumTextField.text.length < 6) {

self.bankName.text = @"";

}

return NO;

}

//编辑结束

- (void)textFieldDidEndEditing:(UITextField*)textField {

if(self.cardNumTextField.text.length<= 0 ||self.cardNumTextField.text.length> 24) {

//提示错误信息

self.bankName.text = @"";

}

}

//根据卡号判断银行

- (NSString*)returnBankName:(NSString*)cardName {

NSString*filePath = [[NSBundle mainBundle]pathForResource:@"bank"ofType:@"plist"];

NSDictionary*resultDic = [NSDictionary dictionaryWithContentsOfFile:filePath];

NSArray*bankBin = resultDic.allKeys;

if(cardName.length< 6) {

return@"";

}

NSString*cardbin_6 ;

if(cardName.length>= 6) {

cardbin_6 = [cardName substringWithRange:NSMakeRange(0, 6)];

}

NSString*cardbin_8 =nil;

if(cardName.length>= 8) {

//8位

cardbin_8 = [cardName substringWithRange:NSMakeRange(0, 8)];

}

if([bankBin containsObject:cardbin_6]) {

return [resultDic objectForKey:cardbin_6];

} else if ([bankBin containsObject:cardbin_8]){

return [resultDic objectForKey:cardbin_8];

} else {

return @"";

}

return@"";

}

下面是效果图

哈哈.gif

github地址