title: UIAlertView with a textfield not popping up keyboard in iOS 8
body: <p>I have a UIAlertView with a textfield inside (UIAlertViewStylePlainTextInput) that automatically pops up a keyboard in iOS 7. However, when I upgraded to iOS 8, the keyboard didn't automatically popup and instead I would have to tap on the textfield to get the keyboard to popup. Is there anyway to restore that automatic keyboard popup to the UIAlertView textfield when I call it?</p>
  
  <pre><code> UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"" message:@"The amount?" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
      alert.alertViewStyle = UIAlertViewStylePlainTextInput;
      UITextField * alertTextField = [alert textFieldAtIndex:0];
      alertTextField.keyboardType = UIKeyboardTypeNumberPad;
      [alertTextField setTextAlignment:NSTextAlignmentCenter];
      [alert show];
      [alert release];
  </code></pre>
  
  <p><strong>Update:</strong> <code>[alertTextField becomeFirstResponder];</code> does not work nor does</p>
  
  <pre><code> [[alert textFieldAtIndex:0] setDelegate:self];
   [[alert textFieldAtIndex:0] becomeFirstResponder];
  </code></pre>
  
  <p>Also, there is a textfield flashing indicator inside the textview, which is problematic because there is no actual keyboard that pops up automatically until the user taps on the textfield itself. </p>