xcode4 - Segue 和 Alertview 的按钮操作

Question

我有 UIStoryboardSegue 设置，如果存在特定条件，想执行 AlertView，取消警报以停止 performSegue 并确定继续 performSegue。我唯一遇到的问题是处理发件人 ID，因为 performSeguewithIdentifier 需要进入 alertView 按钮单击方法。我如何保留发件人（ID）？

- (IBAction)drink1Button:(id)sender {


    if([drink1Units.text intValue] > 0)
    {

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"You Chose" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];

        [alert show];
        [alert release];
    }

}


- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"DrinkSegue"]) {


    // Get destination view
    DrinksListViewController *selectedDrink = [segue destinationViewController];

    // Get button tag
    NSInteger tagIndex = [(UIButton *)sender tag];

    // Set the selected button in the new view
    [selectedDrink setSelectedButton:tagIndex];
    }
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 1) {
       [self performSegueWithIdentifier:@"DrinkSegue" sender:sender];
}