Modal View Issue

Question

I have an issue with some of my views, here is a breif outline of my setup:

Tab Bar Controller
|
--View Controller 1
|
--View Controller 2
|
--View Controller 2

On a certain action, View Controller 1 will display a modal dialogue. Within this dialogue, if the user performs another action, then another modal dialogue is shown, using the first modal dialogue to present the view.

On the 2nd ModalDialog I have a UITextField, however when I attempt to type into the text field, nothing happens. Even though the keyboard is displayed and the textFieldDidBeginEditing method is called. I have setup the UITextFieldDelegate and the nessessary responders, but to no avail.

Does anyone know what would cause this issue?

Many Thanks

Does the UITextField works if the controller is presented in a non-modal way, as adding the view to your UIApplication's keyWindow or just pushing it with a navigation controller? — Felipe Sabino, Jun 17 '11 at 13:52
Not too sure about the issue but same issue is coming for DDAlertPrompt (https://github.com/digdog/DDAlertPrompt) where the text-field is added inside UIAlertView & when key is pressed, it doesn't write anything inside text. But the developer of this project has made some workaround as found here - https://github.com/digdog/DDAlertPrompt/blob/master/DDAlertPrompt.m Hope this would help you to resolve the similar kind of issue. — Sagar, Jun 18 '11 at 09:29

score 3 · Accepted Answer · edited Feb 06 '12 at 08:50

I've found that on a number of occasions with changing views and with popovers that text fields haven't focused correctly with symptoms like you describe. On these occasions I end up deferring the becomeFirstResponder call until the animation has finished or the view has loaded - for example in a view controllers viewDidAppear method.

Or, simply delay the call to becomeFirstResponder with an appropriate guestimate of the time it will take for the views to change / animate / etc. ie:

[textField performSelector:@selector(becomeFirstResponder)
                withObject:nil
                afterDelay:0.3];

score 1 · Answer 2 · answered Jun 17 '11 at 13:46

I would try to 'chain' the modal dialogs from the view controller if that's possible.

The VC opens the 1st modal dialog
Your 1st modal dialog notifies the VC (using delegation probably).
(Maybe required) Close the 1st modal dialog
The VC opens the 2nd modal dialog
Happiness!

score 0 · Answer 3 · answered Jun 17 '11 at 13:40

I'm not sure what you mean with "modal dialogue" -- I assume you mean either a modally presented view controller with a UIModalPresentationFormSheet modal presentation style or a UIPopoverController.

Here's my best guess: I'm pretty sure that your "modal dialogue" captures all user interactions (by default). So when pushing the first one, it captures all input focus. When pushing the second one, it's capture conflicts with the previous one and hence the keyboard will not work.

Anyways, both types of "modal dialogues" are not meant to be stacked. Even if it may work technically, I dislike like it form a interaction-design perspective. Instead of trying to fix the bug or work around it, try to rethink you modal dialogue. You may fit everything into a single one. For example by using a navigation controller inside that view, or by replacing the the view or by flipping it's contents... etc.

Hope this helps, Max

UIPopoverControllers are not available on iPhone, so that rules that out. — fzwo, Jun 17 '11 at 14:03
I'd have to agree with Max, modal view controllers shouldn't be stacked from a human interface point-of-view. Did you consider a paging control? — Wolfgang Schreurs, Jun 17 '11 at 16:05

score 0 · Answer 4 · answered Jun 21 '11 at 15:19

If I were you I would consider revising the navigational hierarchy. Modal dialogs are considered bad enough as it is, but incorporating a modal dialog within a modal dialog is user interface suicide. It causes confusion to the user and is very non-traditional. Is there any way you can use the first modal popup and simply exchange the content?

A side note: You mentioned setting up the view as being a UITextViewDelegate. Did you the view as the delegate for the textbox? Are you returning NO or FALSE from - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string?

Modal View Issue

4 Answers4