title: How do I access the input from my text field in UIAlertController with objective c?
body: <p>I'm changing everything over from AlertView to AlertController, but I can't find anything online for objective c that retrieves what the user inputs in a text field for the AlertController. Here is what I have:</p>
  
  <pre><code>if ([UIAlertController class]) {
              UIAlertController *alertControllerK2 = [UIAlertController
                                                      alertControllerWithTitle:@"\u00A0"
                                                      message:@"Please enter the first number."
                                                      preferredStyle:UIAlertControllerStyleAlert];
              UIAlertAction *K2okAction = [UIAlertAction
                                           actionWithTitle:@"OK"
                                           style:UIAlertActionStyleDefault
                                           handler:nil];
              [alertControllerK2 addTextFieldWithConfigurationHandler:^(UITextField *K2TextField)
               {
                   K2TextField.placeholder = NSLocalizedString(@"Please enter the first number.", @"Please enter the first number.");
               }];
              [alertControllerK2 addAction:K2okAction];
              [self presentViewController:alertControllerK2 animated:YES completion:nil];
          } else {
              UIAlertView *alertK2;
              alertK2 = [[UIAlertView alloc]
                         initWithTitle:@"\u00A0"
                         message:@"Please enter the first number."
                         delegate: self
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
              alertK2.alertViewStyle=UIAlertViewStylePlainTextInput;
              [alertK2 show];
          }
  </code></pre>
  
  <p>The problem is that K2TextField is defined inside the UIAlertController, so I can't access it outside of that code. But if I try to predefine it, I get an error message. Any help would be greatly appreciated!</p>