Storing UITextField contents before view pops

I am sure this is in the Apple documentation or must have been answered somewhere on this forum, since it seems so basic, but I could not find it nor a particularly elegant solution myself.

What I have is a UIViewController that pushes an editing view on its navigation stack. The editing view has a bunch of UITextFields in it. If one of them is being editing when the back button is touched, the original view's ViewWillAppear method is called before either the UITextField delegate methods of textFieldShouldEndEditing or textFieldDidEndEditing, or the IB linked action textFieldEditingEnded method are called.

Here is some code that I hope will make it clearer:

In the UIViewController:

- (void) viewWillAppear: (BOOL) animated {
    [super viewWillAppear: animated];
    NSLog( @"Entering view will appear for master view" );
    nameLabelField.text = objectToEdit.name;
}
- (IBAction) editMyObject: (id) sender {
    NSLog( @"Editing the object" );
    EditViewController *evc = [[EditViewController alloc] initWithNibName: @"EditTableView" bundle: nil];
    evc.editedObject = objectToEdit;
    [self.navigationController pushViewController: evc animated: YES];
    [evc release];
}

In the EditViewController <UITextFieldDelegate>:

- (void) viewWillAppear: (BOOL) animated {
    [super viewWillAppear: animated];
    nameField.text = editedObject.name;
}
- (void) viewWillDisappear: (BOOL) animated {
    [super viewWillDisappear: animated];
    NSLog( @"In viewWillDisappear" );
    if( [self.navigationController.viewControllers indexOfObject: self] == NSNotFound ) {
        NSLog( @"-- We are not in controller stack... the back button has been pushed" );
    }
}
- (BOOL) textFieldShouldEndEditing: (UITextField *) textField {
    NSLog( @"In textFieldShouldEndEditing" );
    // Store text field value here???
    // editedObject.name = nameField.text;
    return Y


                    
                    
                        
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OK, I figured out a simple solution after a lot of web-surfing, forum reading, and manual reading. It was, as I suspected, very simple, only one line of code added. In the viewWillDisappear method of the EditViewContorller I simply added:

    [self.view.window endEditing: YES];

Now textFieldShouldEndEditing, textFieldEditingEnded, and textFieldDidEndEditing all get fired off before the viewWillAppear of the master view does.

So now the viewWillDisappear method looks like:

- (void) viewWillDisappear: (BOOL) animated {
    [super viewWillDisappear: animated];
    NSLog( @"In viewWillDisappear" );
    // Force any text fields that might be being edited to end so the text is stored
    [self.view.window endEditing: YES];
}

And the methods already in place to handle the 'Return' on the keyboard also handle the 'Back' button on the Navigation controller.

Thank you Aaron and Jeff for your assistance and helping me think this through.

answered 2010-11-01T05:16:01.757

Storing UITextField contents before view pops

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