Handle AlertViewController actions

gistfile1.txt

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    NSString *alertTitle = nil;
    NSString *alertMessage = nil;
    NSString *alertOkButtonText = @"Ok";
    
    switch (result) {
        case MFMailComposeResultSent:{
            alertTitle = @"Message Sent";
            alertMessage = @"Your message has been sent";
            break;
        }
        case MFMailComposeResultSaved:{
            alertTitle = @"Message Saved";
            alertMessage = @"Your message has been saved";
            break;
        }
        case MFMailComposeResultCancelled:{
            alertTitle = @"Message Cancelled";
            alertMessage = @"Your message has been cancelled";
            break;}
            
        case MFMailComposeResultFailed:{
            alertTitle = @"Message Failed";
            alertMessage = @"Your message could not be sent";
            break;
        }
    }
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:alertTitle
                                                                             message:alertMessage
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    //We add buttons to the alert controller by creating UIAlertActions:
    UIAlertAction *actionOk = [UIAlertAction actionWithTitle:alertOkButtonText
                                                       style:UIAlertActionStyleDefault
                                                     handler:^(UIAlertAction *action) {
                                                         [alertController dismissViewControllerAnimated:YES completion:nil];
                                                     }]; //You can use a block here to handle a press on this button
    [alertController addAction:actionOk];
    [self presentViewController:alertController animated:YES completion:nil];
}