Change alert action background highlight while using UIAlertController

Question

I'm trying to change the background highlight color for my alertcontroller. For eg in the below image, right now the default background highlight for a cell is light gray, I need to change it to some other color. I saw various post on changing the tint color but I dont need to change the title color only the background highlight. Is this possible?

//This is my current code

- (IBAction)showAlert:(UIButton *)sender {

    UIAlertController *alert =[UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];


    UIAlertAction* save = [UIAlertAction
                                actionWithTitle:@"Save"
                                style:UIAlertActionStyleDefault
                                handler:^(UIAlertAction * action)
                                {
                                    //Perform some action


                                }];

    UIAlertAction* saveas = [UIAlertAction
                                actionWithTitle:@"Save As"
                                style:UIAlertActionStyleDefault
                                handler:^(UIAlertAction * action)
                                {
                                    //Perform some action


                                }];

    UIAlertAction* discard = [UIAlertAction
                                actionWithTitle:@"Discard"
                                style:UIAlertActionStyleDestructive
                                handler:^(UIAlertAction * action)
                                {
                                    //Perform some action


                                }];

    [alert addAction:save];
    [alert addAction:saveas];
    [alert addAction:discard];


    [alert setModalPresentationStyle:UIModalPresentationPopover];
    UIPopoverPresentationController *popPresenter = [alert popoverPresentationController];

    popPresenter.sourceView = sender;
    popPresenter.sourceRect = sender.bounds;
    [self presentViewController:alert animated:YES completion:nil];


}