Is an event triggered when a UITextField with secureTextEntry = YES is cleared?

Question

I have a UITextField instance with secureTextEntry = YES. When the field first gains focus any keypress will clear the field, as appears to be standard behavior on iOS.

As far as I can tell, UIControlEventEditingChanged is not triggered. I have also tried subscribing to UIControlEventAllEditingEvents but it appears not to be triggered. This is causing an issue for me since I'm relying on knowing when the field is edited to set the enabled attribute of a UIButton.

Is there an event which is fired when the field is cleared in this way?

They context around my issue can be seen in this GitHub issue.

It works for me. I have a text field. If I make it secure entry and I add an action for the `UIControlEventEditingChanged` event, my action is called when I tap a key and the text field is cleared. — rmaddy, Sep 04 '13 at 03:42
Confirmed that this works with iOS 6.1; the issue appears to be with the version of iOS I'm targeting. — Paul Young, Sep 04 '13 at 04:19

score 1 · Answer 1 · answered Sep 04 '13 at 02:32

You can use the UITextField's delegate:

- (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSString *newText = [textField.text stringByReplacingCharactersInRange:range withString:text];
    [self performSelector:@selector(updateButton) withObject:nil afterDelay:0.1];
    return YES;
}

- (BOOL)textFieldShouldClear:(UITextField *)textField {
    [self performSelector:@selector(updateButton) withObject:nil afterDelay:0.1];
    return YES;
}

- (void) updateButton {
    someButton.enabled = NO;
}

Paul Young · Answer 2 · 2013-09-04T13:29:23.580

0

If I add an action for UIControlEventAllEvents, the method does not get called when the text field is cleared in this way which confirms that no event is triggered.

edited Sep 04 '13 at 13:29

answered Sep 04 '13 at 03:02

Paul Young

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This was receiving flags for reading like a comment more than an answer. I've undeleted it, but see if you can clarify it beyond a simple remark "which confirms that no event is triggered", which can be easily missed. – BoltClock Sep 04 '13 at 19:09

score 0 · Answer 3 · answered Sep 04 '13 at 03:50

hi you can use the following Method:

 - (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
        [self performSelector:@selector(MakeButtonEnabled:) withObject:nil afterDelay:0.2];
        return YES;
    }

- (void) MakeButtonEnabled:(id)sender {
    UIButton *yourButton=(UIBUtton*) sender;
    yourBUtton.enabled = NO;
}

hope this will help you.

Is an event triggered when a UITextField with secureTextEntry = YES is cleared?

3 Answers3