How to add textfield to an alert view? Xcode 4.5 iOS6 - ios

Question

How do I add a textfield to the alertview? I'm trying to do an app where before the app commits the editing, the user must authenticate 1st by typing his/her password on the said alertview but how can I do this? It seems like the code I've searched doesn't work anymore. Here it is:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Log In" message:#"Please enter your Password" delegate:self cancelButtonTitle:#"Log In" otherButtonTitles:#"Cancel", nil];
[alert addTextFieldWithValue:#"" label:#"Password"];
UITextField *tf = [alert textFieldAtIndex:0];
tf.clearButtonMode = UITextFieldViewModeWhileEditing;
tf.keyboardType = UIKeyboardTypeAlphabet;
tf.keyboardAppearance = UIKeyboardAppearanceAlert;
tf.autocapitalizationType = UITextAutocapitalizationTypeWords;
tf.autocapitalizationType = UITextAutocorrectionTypeNo;
the error said
"No visible #interface for 'UIAlertView'
declares the selector 'addTextFieldWithValue:label:'"
on the [alert addTextFieldWithValue:#"" label:#"Password"];
I also would like to ask how can I put codes on the Confirm button on the alertview.

Answer 1

alert.alertViewStyle = UIAlertViewStylePlainTextInput;
or if you need it to be secure (for passwords)
alert.alertViewStyle = UIAlertViewStyleSecureTextInput;
Edit:
I'm not 100% sure what you mean by "put codes on the confirm button" but if you want to know whether they pushed confirm or cancel, you only need to implement
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
//check the button index and do something if it's the right one.
}

Answer 2

Adding a textField into an alert view (Swift):
let pincodeAlert:UIAlertController = UIAlertController(title: "Hello", message: "Enter a new passcode", preferredStyle: UIAlertControllerStyle.Alert)
pincodeAlert.addTextFieldWithConfigurationHandler({ (pinCodeTextField:UITextField!) -> Void in
pinCodeTextField.placeholder = "password"
pinCodeTextField.secureTextEntry = true
})
//Add the textField
pincodeAlert.addTextFieldWithConfigurationHandler({ (pinCodeTextField2:UITextField!) -> Void in
pinCodeTextField2.placeholder = "Confirm password"
pinCodeTextField2.secureTextEntry = true
})
pincodeAlert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: { (action) -> Void in
//check entered passcodes
}))
pincodeAlert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil))
presentViewController(pincodeAlert, animated: true, completion: nil)
To check the data in the checkBoxes just add this in your "OK" Action handler:
let passcodeEntered:String = (pincodeAlert.textFields?.first as UITextField).text