Ios 正在尝试创建一个表单以将联系人添加到设备中--如何处理空字段？

我有一个简单的表单，现在只包含四个字段（稍后我会添加更多）

• 名字
• 姓
• 家庭电子邮件
• 工作电子邮件

我只想将具有值的项目保存为新联系人。现在，如果我没有输入值，那么在联系人页面中，该值为“NULL”。处理这个问题的适当方法是什么

这是我的密码

#pragma mark - Add New Contacts Methods

- (IBAction)savePublicContact:(UIBarButtonItem *)sender {        
    CFErrorRef  anError = NULL;
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &anError);
    ABRecordRef person = ABPersonCreate();
    Person *personUserDefined = [self populatePersonToSave];

    ABRecordSetValue(person,kABPersonFirstNameProperty,(__bridge CFTypeRef)(personUserDefined.firstName),&anError);
    ABRecordSetValue(person,kABPersonLastNameProperty,(__bridge CFTypeRef)(personUserDefined.lastName),&anError);

    ABMutableMultiValueRef emailMultiValue = ABMultiValueCreateMutable(kABPersonEmailProperty);
    ABMultiValueAddValueAndLabel(emailMultiValue, (__bridge CFTypeRef)(personUserDefined.homeEmail), (CFStringRef)@"Home Email", NULL);
    ABMultiValueAddValueAndLabel(emailMultiValue, (__bridge CFTypeRef)(personUserDefined.workEmail), (CFStringRef)@"Work Email", NULL);
    ABRecordSetValue(person, kABPersonEmailProperty, emailMultiValue, &anError);

    ABAddressBookAddRecord(addressBook, person, &anError);

    if(ABAddressBookSave(addressBook, &anError)){
        UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Added Contact"
                                                               message:@"You successfully added a contact"
                                                              delegate:self
                                                     cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alertsuccess show];

    }else{
        UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Contact Error"
                                                               message:(@"Contact was not able to be added")
                                                              delegate:self
                                                     cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alertsuccess show];
    }


}

- (Person *)populatePersonToSave
{
    Person *person = [[Person alloc] init];

    if([self.firstNameToSaveTextField.text length] > 0){
        person.firstName = self.firstNameToSaveTextField.text;
    }

    if([self.lastNameToSaveTextField.text length] > 0) {
        person.lastName = self.lastNameToSaveTextField.text;
    }

    if([self.workEmailToSaveTextField.text length] > 0){
        person.workEmail = self.workEmailToSaveTextField.text;
    }

    if([self.homeEmailToSaveTextField.text length] > 0){
        person.homeEmail = self.homeEmailToSaveTextField.text;
    }

    return person;
}

#pragma标记-添加新联系人方法
-（iAction）savePublicContact:（UIBarButtonItem*）发件人{
CFErrorRef anError=NULL；
ABAddressBookRef addressBook=ABAddressBookCreateWithOptions（NULL，&A错误）；
ABRecordRef person=ABPersonCreate（）；
如果（[self isvalidDetails]）{//使用新方法验证详细信息，则将根据验证返回是/否
Person*personUserDefined=[自填充PersonToSave]；
ABRecordSetValue（person、kabbersonfirstnameproperty、（\uu-bridge-CFTypeRef）（personUserDefined.firstName）和一个错误）；
ABRecordSetValue（person、kABPersonLastNameProperty、（uu桥CFTypeRef）（personUserDefined.lastName）和一个错误）；
ABMutableMultiValueRef emailMultiValue=ABMultiValueCreateMutable（kabbersonemailproperty）；
ABMultiValueAddValueAndLabel（emailMultiValue，（u桥CFTypeRef）（personUserDefined.homemail），（CFStringRef）@“Home Email”，NULL）；
ABMultiValueAddValueAndLabel（emailMultiValue，（u桥CFTypeRef）（personUserDefined.workEmail），（CFStringRef）@“工作电子邮件”，NULL）；
ABRecordSetValue（person、KabbersoneMailProperty、emailMultiValue和anError）；
ABAddressBookAddRecord（地址簿、人员和错误）；
if（ABAddressBookSave（地址簿和A错误））{
UIAlertView*alertsuccess=[[UIAlertView alloc]initWithTitle:@“已添加联系人”
消息：@“您已成功添加联系人”
代表：赛尔夫
取消按钮提示：@“确定”其他按钮提示：无，无]；
[成功表演];；
}否则{
UIAlertView*alertsuccess=[[UIAlertView alloc]initWithTitle:@“联系人错误”
消息：（@“无法添加联系人”）
代表：赛尔夫
取消按钮提示：@“确定”其他按钮提示：无，无]；
[成功表演];；
}
}
}
-（BOOL）isValidDetails{
BOOL isValidated=TRUE；
if（[self.firstNameToSaveTextField.text length]0）{
UIAlertView*alertsuccess=[[UIAlertView alloc]initWithTitle:@“必填字段”
消息：（@“请输入姓氏”）
代表：赛尔夫
取消按钮提示：@“确定”其他按钮提示：无，无]；
[成功表演];；
isValidated=FALSE；
退货已确认；
}
如果（[self.workEmailToSaveTextField.text length]>0）{
UIAlertView*alertsuccess=[[UIAlertView alloc]initWithTitle:@“必填字段”
信息：（@“请输入工作电子邮件”）
代表：赛尔夫
取消按钮提示：@“确定”其他按钮提示：无，无]；
[成功表演];；
isValidated=FALSE；
退货已确认；
}
如果（[self.homemailtosavetextfield.text length]>0）{
UIAlertView*alertsuccess=[[UIAlertView alloc]initWithTitle:@“必填字段”
信息：（@“请输入家庭电子邮件”）
代表：赛尔夫
取消按钮提示：@“确定”其他按钮提示：无，无]；
[成功表演];；
isValidated=FALSE；
退货已确认；
}
退货已确认；
}
-（人*）populatePersonToSave
{
Person*Person=[[Person alloc]init]；
如果（[self.firstNameToSaveTextField.text length]>0）{
person.firstName=self.firstNameToSaveTextField.text；
}
如果（[self.lastNameToSaveTextField.text length]>0）{
person.lastName=self.lastNameToSaveTextField.text；
}
如果（[self.workEmailToSaveTextField.text length]>0）{
person.workEmail=self.workEmailToSaveTextField.text；
}
如果（[self.homemailtosavetextfield.text length]>0）{
person.homemail=self.homemailtosavetextfield.text；
}
返回人；
}

#pragma标记-添加新联系人方法
-（iAction）savePublicContact:（UIBarButtonItem*）发件人{
CFErrorRef anError=NULL；
ABAddressBookRef addressBook=ABAddressBookCreateWithOptions（NULL，&A错误）；
ABRecordRef person=ABPersonCreate（）；
如果（[self isvalidDetails]）{//使用新方法验证详细信息，则将根据验证返回是/否
Person*personUserDefined=[自填充PersonToSave]；
ABRecordSetValue（person、kabbersonfirstnameproperty、（\uu-bridge-CFTypeRef）（personUserDefined.firstName）和一个错误）；
ABRecordSetValue（person、kABPersonLastNameProperty、（uu桥CFTypeRef）（personUserDefined.lastName）和一个错误）；
ABMutableMultiValueRef emailMultiValue=ABMultiValueCreateMutable（kabbersonemailproperty）；
ABMultiValueAddValueAndLabel（emailMultiValue，（u桥CFTypeRef）（personUserDefined.homemail），（CFStringRef）@“Home Email”，NULL）；
ABMultiValueAddValueAndLabel（emailMultiValue，（u桥CFTypeRef）（personUserDefined.workEmail），（CFStringRef）@“工作电子邮件”，NULL）；
ABRecordSetValue（个人、kABPersonEmailProperty、em
#pragma mark - Add New Contacts Methods

- (IBAction)savePublicContact:(UIBarButtonItem *)sender {

    CFErrorRef  anError = NULL;
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &anError);
    ABRecordRef person = ABPersonCreate();

    if([self isvalidDetails]){ //New method to validate details - this will return yes/no based on validation
        Person *personUserDefined = [self populatePersonToSave];
        ABRecordSetValue(person,kABPersonFirstNameProperty,(__bridge CFTypeRef)(personUserDefined.firstName),&anError);
        ABRecordSetValue(person,kABPersonLastNameProperty,(__bridge CFTypeRef)(personUserDefined.lastName),&anError);

        ABMutableMultiValueRef emailMultiValue = ABMultiValueCreateMutable(kABPersonEmailProperty);
        ABMultiValueAddValueAndLabel(emailMultiValue, (__bridge CFTypeRef)(personUserDefined.homeEmail), (CFStringRef)@"Home Email", NULL);
        ABMultiValueAddValueAndLabel(emailMultiValue, (__bridge CFTypeRef)(personUserDefined.workEmail), (CFStringRef)@"Work Email", NULL);
        ABRecordSetValue(person, kABPersonEmailProperty, emailMultiValue, &anError);

        ABAddressBookAddRecord(addressBook, person, &anError);

        if(ABAddressBookSave(addressBook, &anError)){
            UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Added Contact"
                                                                   message:@"You successfully added a contact"
                                                                  delegate:self
                                                         cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alertsuccess show];

        }else{
            UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Contact Error"
                                                                   message:(@"Contact was not able to be added")
                                                                  delegate:self
                                                         cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alertsuccess show];
        }
    }

}

-(BOOL)isValidDetails{
    BOOL isValidated = TRUE;

    if([self.firstNameToSaveTextField.text length] <= 0){ //Trim and check length
        UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Required field"
                                                               message:(@"Please enter firstname")
                                                              delegate:self
                                                     cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alertsuccess show];
        isValidated = FALSE;
        return isValidated;
    }

    if([self.lastNameToSaveTextField.text length] > 0) {
        UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Required field"
                                                               message:(@"Please enter lastname")
                                                              delegate:self
                                                     cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alertsuccess show];
        isValidated = FALSE;
        return isValidated;
    }

    if([self.workEmailToSaveTextField.text length] > 0){
        UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Required field"
                                                               message:(@"Please enter work email")
                                                              delegate:self
                                                     cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alertsuccess show];
        isValidated = FALSE;
        return isValidated;
    }

    if([self.homeEmailToSaveTextField.text length] > 0){
        UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Required field"
                                                               message:(@"Please enter home email")
                                                              delegate:self
                                                     cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alertsuccess show];
        isValidated = FALSE;
        return isValidated;
    }
    return isValidated;
}

- (Person *)populatePersonToSave
{
    Person *person = [[Person alloc] init];

    if([self.firstNameToSaveTextField.text length] > 0){
        person.firstName = self.firstNameToSaveTextField.text;
    }

    if([self.lastNameToSaveTextField.text length] > 0) {
        person.lastName = self.lastNameToSaveTextField.text;
    }

    if([self.workEmailToSaveTextField.text length] > 0){
        person.workEmail = self.workEmailToSaveTextField.text;
    }

    if([self.homeEmailToSaveTextField.text length] > 0){
        person.homeEmail = self.homeEmailToSaveTextField.text;
    }

    return person;
}

if (personUserDefined.firstName) {
    ABRecordSetValue(person,kABPersonFirstNameProperty,(__bridge CFTypeRef)(personUserDefined.firstName),&anError);
}


if (personUserDefined.lastName) {
    ABRecordSetValue(person,kABPersonLastNameProperty,(__bridge CFTypeRef)(personUserDefined.lastName),&anError);
}

ABMutableMultiValueRef emailMultiValue = ABMultiValueCreateMutable(kABPersonEmailProperty);
if (personUserDefined.homeEmail) {
    ABMultiValueAddValueAndLabel(emailMultiValue, (__bridge CFTypeRef)(personUserDefined.homeEmail), (CFStringRef)@"Home Email", NULL);
}

if (personUserDefined.workEmail) {
    ABMultiValueAddValueAndLabel(emailMultiValue, (__bridge CFTypeRef)(personUserDefined.workEmail), (CFStringRef)@"Work Email", NULL);
}
ABRecordSetValue(person, kABPersonEmailProperty, emailMultiValue, &anError);
ABAddressBookAddRecord(addressBook, person, &anError);