shouldChangeCharactersInRange is not getting called

Question

I have a textfield in the alertview called phoeNumberTF.

phoneNumberTF.delegate = self;

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Enter your phone number" message:nil preferredStyle:UIAlertControllerStyleAlert];

[alert addAction:[UIAlertAction
                  actionWithTitle:@"Send"
                  style:UIAlertActionStyleDefault
                  handler:^(UIAlertAction * action)
                  {
                      NSArray * textfields = alert.textFields;
                      phoneNumberTF = textfields[0];
                      [self sendPhoneNumber:phoneNumberTF.text];
                  }]];

shouldChangeCharactersInRange delegate method is not getting called

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{

}

No, you do not have a text field in the alert controller. `phoneNumberTF` has nothing to do with the alert. — rmaddy, Apr 06 '18 at 04:10
The code you have posted does not add a text field to the alert controller. Is there more code you are not showing? — rmaddy, Apr 06 '18 at 04:13
@rmaddy if he doesn't have text field, he will got crash when using `phoneNumberTF = textfields[0];` not only the method isn't called. Maybe he add textField but didn't write it on the question. If you give my answer down vote, consider your decision — trungduc, Apr 06 '18 at 04:13
See https://stackoverflow.com/questions/39246989/how-to-check-the-textfiled-input-string-when-user-inputting — rmaddy, Apr 06 '18 at 04:24

score 2 · Accepted Answer · edited Jul 04 '21 at 19:47

2

phoneNumberTF is not a part of UIAlertController so no need of delegate for this phoneNumberTF.delegate = self;

add the configuration delegate to your UIAlertController

 UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Enter your phone number" message:nil preferredStyle:UIAlertControllerStyleAlert];


[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) 
{

textField.delegate = self;
}];

for more info you get the sample here

edited Jul 04 '21 at 19:47

shim

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answered Apr 06 '18 at 03:52

Anbu.Karthik

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1

You should mention that `phoneNumberTF` is not part of the alert and is not needed. – rmaddy Apr 06 '18 at 04:11

shouldChangeCharactersInRange is not getting called

1 Answers1