[Mac / iOS](UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

    //以UIAlertView的title來決定判斷式

    if ([alertView.title isEqualToString:@"Item A"])
    {
        if (buttonIndex == 0)     //若user於UIAlertView上click第一個按鈕
        {

            

            

        }

        else if (buttonIndex == 1)//若user於UIAlertView上click第二個按鈕

        {

        }
    }
    else if ([alertView.title isEqualToString:@"Item B"])
    {

        

    }
}

而後我們可以於任意地方建立UIAlertView

UIAlertView *alertView = [[UIAlertView alloc] init];

alertView.delegate = self;
alertView.title = @"Item A";

alertView.alertViewStyle = UIAlertViewStylePlainTextInput; //可輸入文字的TextField

[alertView addButtonWithTitle:@"OK"];
[alertView addButtonWithTitle:@"Cancel"];
[alertView show];