没有得到“-”“。” " " 在从 ABPerson 的电话簿中接听联系人时

Question

我想得到带有“-”“”“。”的数字。从电话簿中获取联系人时，这是我的代码。
我的主要动机是从号码中提取国家代码（如果存在 +）。
如果有任何其他方法可以访问国家代码，也请建议我。

    - (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController                                                        *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier;
    {
        if (property == kABPersonPhoneProperty) {
            ABMultiValueRef multiPhones = ABRecordCopyValue(person, kABPersonPhoneProperty);
    for(CFIndex i = 0; i < ABMultiValueGetCount(multiPhones); i++) {
        if(identifier == ABMultiValueGetIdentifierAtIndex (multiPhones, i)) {
            CFStringRef phoneNumberRef = ABMultiValueCopyValueAtIndex(multiPhones, i);
            CFRelease(multiPhones);
            NSString *phoneNumber = (__bridge NSString *) phoneNumberRef;
            CFRelease(phoneNumberRef);
            if ([phoneNumber rangeOfString:@"+"].location == NSNotFound) {
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@"(" withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@")" withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@" " withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@"-" withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@"." withString:@""];

                self.lblMobileNumber.text = [NSString stringWithFormat:@"%@", phoneNumber];
            } else {
                NSArray *PhoneNumberComponents = [phoneNumber componentsSeparatedByString:@" "];
                NSString * strCountryCode = PhoneNumberComponents[0] ;
                [self.btnCountryCode setTitle:strCountryCode forState:UIControlStateNormal];

                phoneNumber= [phoneNumber stringByReplacingOccurrencesOfString:PhoneNumberComponents[0] withString:@""];
                NSLog(@"countryCodeSepratedStr%@",phoneNumber);
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@"(" withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@")" withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@" " withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@"-" withString:@""];
                phoneNumber = [phoneNumber stringByReplacingOccurrencesOfString:@"." withString:@""];
                self.lblMobileNumber.text = [NSString stringWithFormat:@"%@", phoneNumber];

            }

        }
    }
  }
  return NO;
 }

Answer 1

我不会倾向于做任何字符串操作的东西，而只是使用正则表达式来查找+，后跟字符串开头的数字，使用捕获括号来获取国家代码：

NSError *error;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"^\\s*\\+\\s*(\\d+)[^\\d]*(.*)$" options:0 error:&error];

NSTextCheckingResult *result = [regex firstMatchInString:phoneNumber options:0 range:NSMakeRange(0, [phoneNumber length])];
if (result) {
    NSString *countryCode = [phoneNumber substringWithRange:[result rangeAtIndex:1]];
    NSString *phoneNumberWithoutCountryCode = [phoneNumber substringWithRange:[result rangeAtIndex:2]];
} else {
    // no country code found
}