UIAlertView basics

gistfile1.m

//basic alert view , remember <UIAlertViewDelegate> 
- (IBAction)showMessage:(id)sender {
    UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Hello World!"
                                                      message:@"This is your  UIAlertview message."
                                                     delegate:nil
                                            cancelButtonTitle:@"OK"
                                            otherButtonTitles:nil];
    [message show];

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


//UIAlertView with buttons 
UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Hello World!"
                                                  message:@"This is yourUIAlertview message."
                                                 delegate:nil
                                        cancelButtonTitle:@"Button 1"
                                        otherButtonTitles:@"Button 2", @"Button 3", nil];
[message show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
    if([title isEqualToString:@"Button 1"])
    {
        NSLog(@"Button 1 was selected.");
    }
    else if([title isEqualToString:@"Button 2"])
    {
        NSLog(@"Button 2 was selected.");
    }
    else if([title isEqualToString:@"Button 3"])
    {
        NSLog(@"Button 3 was selected.");
    }
}

//