(iOS) ActionSheet and UIALert

ActionSheetController.mm

//You need to add the <UIActionSheetDelegate> protocol in your .h file interface

//@interface BIDViewController : UIViewController <UIActionSheetDelegate>

//Action when a button is pressed
- (IBAction)buttonPressed:(id)sender {
    UIActionSheet *actionSheet = [[UIActionSheet alloc]
                                  initWithTitle:@"Are you sure?"
                                  delegate:self
                                  cancelButtonTitle:@"No Way!"
                                  destructiveButtonTitle:@"Yes, I'm Sure!"
                                  otherButtonTitles:nil];
    [actionSheet showInView:self.view];
}

//In delegate: we put "self" so in this controller the below method will be triggered.
//It's an inherited method which we'll override
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    //Get what the user has chosen
    if (buttonIndex != [actionSheet cancelButtonIndex])   //Not the cancel button
    {
        NSString *msg = nil;

        if (self.nameField.text.length > 0)
            msg = [NSString stringWithFormat:"You can breathe easy, %@, everything went OK.",
                   self.nameField.text];
        else
            msg = @"You cancelled.";
    }
}

UIAlertController.mm

//An action that pops up an alert

- (IBAction)yellowButtonPressed 
{
    UIAlertView *alert = [[UIAlertView alloc]
                          initWithTitle:@"Yellow View Button Pressed"
                          message:@"You pressed the button on the yellow view"
                          delegate:nil
                          cancelButtonTitle:@"Yep, I did."
                          otherButtonTitles:nil];
    [alert show];
}