Question

In my application I have implemented the Push notification feature and I am getting the notifications. I used the following code in the appDelegate file.

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    for (id key in userInfo) {
        NSMutableArray *array = [userInfo objectForKey:key];
        NSString *message = [NSString stringWithFormat:@"%@",[array valueForKey:@"alert"]];
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"iPhoneApp" message:message delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
        [alert show];
        [alert release];
    }    
}

I want to perform actions on the OK button click event of the Push notification alert (when the app is running). I have three view controllers in this app. So in which class should I add the code

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

Answer 1

In the same class you set as the delegate of that particular UIAlertView. In your current case, the AppDelegate is the receiver of the -clickedButtonAtIndex:.

If you would like to receive the click events in one of the 3 controllers you have. You must set that particular controller as the delegate to your UIAlertView:

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"iPhoneApp" message:message delegate:myViewController cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
    [alert show];
    [alert release];

As you see I assigned myViewController as the delegate. myViewController should conform to the UIAlertViewDelegate protocol and implement the -clickedButtonAtIndex: method. Now once you select one of the button’s you will get the call in myViewController.