ios - 无法将对象保存到 CoreData

Question

我有一个数据模型，其实体为 HYUser，属性为 firstName、lastName、email 、性别 和电话。当我检查我的 .sqlite 数据库时，那里什么也没有。我已经附上了应该保存我的对象的整个按钮操作。

- (IBAction)btnUserDataSave:(id)sender {
NSEntityDescription * entityDescription = [NSEntityDescription entityForName:@"HYUser" inManagedObjectContext:context];
NSManagedObject *newUser = [[NSManagedObject alloc]initWithEntity:entityDescription insertIntoManagedObjectContext:context];
NSString *gender = NULL;
NSError *error = nil;

[newUser setValue:self.txtfFirstName.text forKey:@"firstName"];
[newUser setValue:self.txtfLastName.text forKey:@"lastName"];
[newUser setValue:self.txtfPhoneNumber.text forKey:@"phone"];
[newUser setValue:self.txtfUserEmail.text forKey:@"email"];

if (self.segmentControlGender.selectedSegmentIndex == 0) {
    gender = @"Male";
}else if(self.segmentControlGender.selectedSegmentIndex == 1){
    gender = @"Female";
}else{
    NSLog(@"ERROR in gender saving");
}
[newUser setValue:gender forKey:@"gender"];

if ([self.txtfFirstName.text  isEqual: @""] || [self.txtfLastName.text  isEqual: @""] || [self.txtfPhoneNumber.text  isEqual: @""] || [self.txtfUserEmail.text  isEqual: @""]) {
    UIAlertController* errorPrompt = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"Required Fields", @"Required Fields")
                                                                         message:NSLocalizedString(@"All fields are required to complete Sign-up. ", nil)
                                                                  preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction* okAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"OK",nil)
                                                       style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

                                                       }];
    [errorPrompt addAction:okAction];
    [self presentViewController:errorPrompt animated:YES completion:NULL];

}else{
    if(![context save:&error]) {
        self.labelStatus.text = @"Error";
        NSLog(@"%@, %@", error, error.localizedDescription);
    }else{
        [context save:&error];
        self.labelStatus.text = @"Saved";

    }
}
}

Answer 1

我解决了这个问题，看起来它与我尝试保存对象的方式有关。以下是我注册新用户的完整代码。

- (IBAction)btnUserDataSave:(id)sender {


HYUser* signUpUserObject = [NSEntityDescription insertNewObjectForEntityForName:@"HYUser" inManagedObjectContext:context];

NSString *gender = nil;
NSError *error = nil;

if ([self.txtfFirstName.text  isEqual: @""] || [self.txtfLastName.text  isEqual: @""] || [self.txtfPhoneNumber.text  isEqual: @""] || [self.txtfUserEmail.text  isEqual: @""]) {
    UIAlertController* errorPrompt = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"Required Fields", @"Required Fields")
                                                                         message:NSLocalizedString(@"All fields are required to complete Sign-up. ", nil)
                                                                  preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction* okAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"OK",nil)
                                                       style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

                                                       }];
    [errorPrompt addAction:okAction];
    [self presentViewController:errorPrompt animated:YES completion:NULL];

}
else {


    self.labelStatus.text = @"Saved";
    [signUpUserObject setValue:self.txtfFirstName.text forKey:@"firstName"];
    [signUpUserObject setValue:self.txtfLastName.text forKey:@"lastName"];
    [signUpUserObject setValue:self.txtfPhoneNumber.text forKey:@"phone"];
    [signUpUserObject setValue:self.txtfUserEmail.text forKey:@"email"];

    gender =  self.segmentControlGender.selectedSegmentIndex == 0 ? @"Male" : @"Female";

    [signUpUserObject setValue:gender forKey:@"gender"];

    if(![context save:&error]) {
        self.labelStatus.text = @"Error";
        NSLog(@"%@, %@", error, error.localizedDescription);
    }
    else {
        UIAlertController* errorPrompt = [UIAlertController alertControllerWithTitle:@"HairYourWay"
                                                                             message:NSLocalizedString(@"STR_NEW_USER_SIGN_UP_SUCCEEDED", @"Success")
                                                                      preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction* okAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"OK",nil)
                                                           style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
                                                               [self.navigationController popViewControllerAnimated:YES];
                                                           }];
        [errorPrompt addAction:okAction];
        [self presentViewController:errorPrompt animated:YES completion:NULL];

    }
}
}