How to do something before unwind segue action?

Question

I\'ve just figured out what is an unwind segue and how to use it with the great answers from this question. Thanks a lot.

However, here\'s a question like this:

Answer 1

At first, you should call the send data function in prepareForSegue method.

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if([[segue identifier] isEqualToString:@"UnwindIdentifier"]) {
        // send data
    }
}

If you don't want to let unwind segue happen before getting response from the server, you should override

- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender

method and return NO;. Then you can perform segue manually when you get the server response by calling:

[self performSegueWithIdentifier:@"UnwindIdentifier" sender:sender];