Question

I have a UIView subclass with an added observer for the UIKeyboardWillShowNotification and UIKeyboardWillHideNotification. This UIView is in a UITableViewCell subclass. I have two other UITableViewCell subclasses that contain UITextFields. When those text fields are tapped, my custom UIView receives those notifications. I have these three UITableViewCell subclasses setup for a email composer view type of thing.

How can I make sure that when my UIView subclass receives the keyboard will show or hide notification that it is for the UIView and not to the other UITableViewCell's that contain ui text fields?

I should mention that I have a UIWebView in my UIView subclass. When a contenteditable div is tapped, I want to receive notification that the keyboard came up but only for my UIWebView instance.

I was thinking I could do the following, but that doesn’t seem to work.

[[NSNotificationCenter defaultCenter] addObserver:self selector@(selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:_webView];

Answer 1

I think it depends for what you need the UIKeyboardNotification, you can achieve the same thing with:

- (void)textFieldDidBeginEditing:(UITextField *)textField

To see when the editing did begin. And this to see when the editing did end:

- (void)textFieldDidEndEditing:(UITextField *)textField

Don’t forget your UITableViewCells must comply with the UITextFieldDelegate protocol.

Quick reference about the UITextFieldDelegate protocol.

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Edit: One more thing, the solution I gave you makes sense when you have the need to know when a specific UITextField became first responder. If you don’t care about that, and you just need to know when the keyboard actually comes and goes, you should notify the UIViewController that have your UITableView instead of each individual cell. The UIViewController should then take the proper action.