文本字段值未及时更新以保存textFieldDidEndEditing

Question

I'm working on a simple app that uses Core Data. I have a detail screen with a textfield that I want to have saved when I click a done button. Right now, the done action is being completed before textFieldDidEndEditing is being called.

(Using xcode 6)

I can get the field input logged to the console. so I think I have the outlets set up correctly and the delegate relationships in place.

Here's what I believe to be the relevant code:

- (void) textFieldDidEndEditing:(UITextField *)textField
{
    self.seasonName = textField.text;
    NSLog(@"Did End Editing: %@", self.seasonName);
}

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

    Season *season = nil;

    if (self.seasonToEdit) {
        season = self.seasonToEdit;
    } else {
        season = [NSEntityDescription insertNewObjectForEntityForName:@"Season" inManagedObjectContext:self.managedObjectContext];
    }

    season.seasonName = self.seasonName;
    //season.seasonDescription = self.seasonDescriptionTextView.text;

    NSLog(@"Season name: %@", season.seasonName);

    [self dismissViewControllerAnimated:YES completion:nil];
}

As you can see from this log, I'm getting the message from the done action before the textfieldDidEndEditing call:

2014-10-08 16:36:10.318 ScorerCD[12277:475893] Season name: (null)
2014-10-08 16:36:10.842 ScorerCD[12277:475893] Did End Editing: the 

Where is my problem? Thanks.

Edited: I tried resignFirstResponder at top of done method with no impact. Also, I tried setting season.seasonName = self.seasonNameTextField.text with no change.

Another edit: If I use this code either with or without the self.seasonName = newText I see that the characters are being entered in the text field but self.seasonNameTextField.text remains null when I try to retrieve it.

- (BOOL)textField:(UITextField *)theTextField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *newText = [theTextField.text stringByReplacingCharactersInRange:range withString:string];

    self.doneBarButton.enabled = ([newText length] > 0);

    NSLog(@"In change characters");

    self.seasonName = newText;

    return YES;
}

Edited: More log info

2014-10-09 09:46:33.280 ScorerCD[13179:517301] New Season
2014-10-09 09:46:37.788 ScorerCD[13179:517301] In change characters
2014-10-09 09:46:37.792 ScorerCD[13179:517301] In change characters
2014-10-09 09:46:42.104 ScorerCD[13179:517301] In change characters
2014-10-09 09:46:42.343 ScorerCD[13179:517301] In change characters
2014-10-09 09:46:42.627 ScorerCD[13179:517301] In change characters
2014-10-09 09:46:45.112 ScorerCD[13179:517301] Season to edit: (null)
2014-10-09 09:46:45.194 ScorerCD[13179:517301] Season: <Season: 0x7be3b7d0> (entity: Season; id: 0x7be323c0 <x-coredata:///Season/t7CBA137F-F348-47E6-A0EA-2518DAF422392> ; data: {
    games = nil;
    seasonDescription = nil;
    seasonName = nil;
})
2014-10-09 09:46:45.194 ScorerCD[13179:517301] Season name: (null)
2014-10-09 09:46:45.712 ScorerCD[13179:517301] In change characters
2014-10-09 09:46:45.744 ScorerCD[13179:517301] Did End Editing: the high

Edited: Here is my code in AppDelegate to create the MOC and pass it to the SeasonVC and the code that passes it to the SeasonFactsVC.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.

    UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
    SeasonsViewController *controller = navigationController.viewControllers[0];
    controller.managedObjectContext = self.managedObjectContext;
    return YES;
}

- (NSManagedObjectContext *)managedObjectContext {
    // Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.)
    if (_managedObjectContext != nil) {
        return _managedObjectContext;
    }

    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
    if (!coordinator) {
        return nil;
    }
    _managedObjectContext = [[NSManagedObjectContext alloc] init];
    [_managedObjectContext setPersistentStoreCoordinator:coordinator];
    return _managedObjectContext;
}
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"AddSeason"]) {
        UINavigationController *navigationController = segue.destinationViewController;
        SeasonFactsViewController *controller = (SeasonFactsViewController *) navigationController.topViewController;
        controller.managedObjectContext = self.managedObjectContext;
        controller.seasonToEdit = nil;
    }
}

Answer 1

See this answer -- https://stackoverflow.com/a/9101699/3096507

Basically textFieldDidEndEditing is called when the keyboard is dismissed. Which probably isn't until after you click the done button.

So you can either check your textField in your done method or use - (BOOL)textFieldShouldReturn:(UITextField *)textField instead.

Answer 2

Looking at this the text field is being resigned as part of you dismissing the view controller at the end of the done method. Not before. If you want to get the textfields text sooner you could link the field as an outlet and get the text value from that Ie self.mytextfield.text either that or call resignFirstResponder on the text field at the top of the done method.

EDIT:

create an outlet for your textfield (and link it to your textfield in interface builder):

@property (nonatomic, weak) IBOutlet UITextfield *seasonNameTextField;

then update your done method

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

    Season *season = nil;

    if (self.seasonToEdit != nil) {
        season = self.seasonToEdit;
    } else {
        season = [NSEntityDescription insertNewObjectForEntityForName:@"Season" inManagedObjectContext:self.managedObjectContext];
    }

    season.seasonName = self.seasonNameTextField.text;

    [self dismissViewControllerAnimated:YES completion:nil];
}

Answer 3

You loose the Focus of your TextField AFTER you clicked on a new UI Control. So you will always have your Button function first called before the DidEndEdition will fire.

You could use

textViewDidChange

to update your seasonName

Answer 4

- (void) textFieldDidEndEditing:(UITextField *)textField gets called after your text field resign first responder which is after you click the save button so there is no problem with that. If you have the text field outlet why not directly check that and assign value?