How to get UIAlertView to call `alertViewShouldEnableFirstOtherButton:` after making changes?

Question

I have a UIAlertView with a UITextField. I have connected a UIAlertView delegate, and I believe YES or NO in alertViewShouldEnableFirstOtherButton: depending on the text in the UITextField.

I need to change the text of the text field programmatically. This works as expected.

Unfortunately, I don’t know how to make UIAlertView call the delegate method alertViewShouldEnableFirstOtherButton: to enable or disable another button after I changed the text of the text box.

I thought that the UIAlertView was registered as a UITextField object, so I tried sending UIControlEventValueChanged from textField. Does not work.

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From the stack trace, it turned out that the delegate method was called from the private UIAlertView _alertSheetTextFieldDidChange: method.

So, if I do [self.currentAlert performSelector:@selector(_alertSheetTextFieldDidChange:) withObject:textField]; after changing the text, the delegate method is called and the state for turning on the button changes. But, since this is a private method, the application is likely to be rejected. I do not want to risk it.

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Is there a clean way to make an alertViewShouldEnableFirstOtherButton: view alert alertViewShouldEnableFirstOtherButton: ?

Answer 1

I was on the right track with sending a control event. I just choose the wrong event.

This will work:

 [textField sendActionsForControlEvents:UIControlEventEditingChanged];