Alert view in iphone

Question

hi i am new to iphone application development, i want to design an alert view, which has 2 buttons, OK and cancel. On Ok Button the i will print say an message hello and on cancel button i will print cancel.. Please help how am i to do it

Answer 1

To show the alert:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Do you want to say hello?" message:@"More info..." delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Say Hello"];
[alert show];
[alert release];

To respond to whatever button was tapped:

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
    if (buttonIndex == 0) {
     NSLog(@"Cancel Tapped.");
    }
    else if (buttonIndex == 1) {
     NSLog(@"OK Tapped. Hello World!");
    }
}

For more information, see the UIAlertView Class Reference and the UIAlertView Delegate Protocol Reference.

Answer 2

Show the alert with the following snippet

UIAlertView *alert = [[UIAlertView alloc]
   initWithTitle:@"Make an informed choice"
   message:nil
   delegate:self
   cancelButtonTitle:@"Cancel"
   otherButtonTitles:@"OK", nil];
[alert show];

The delegate is set to self so when the alert is dismissed our own class will get a call back. The delegate must implement the UIAlertViewDelegate protocol.

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

   if (buttonIndex == 1) {
      // Do it!
   } else {
      // Cancel
   }
}