Classic Delegation

// Classic delegation
- (void)myOperationDidSucceed:(id data) {
    [myView hideLoadingIndicator];
    // Do something with data
}

- (void)myOperationDidFail:(NSError *)error {
    [myView hideLoadingIndicator];
    // Do something with the error
}

- (void)myOperationDidReachAnotherOutcome:(NSDictionary *info) {
    [myView hideLoadingIndicator];
    // Do something with info
}