gistfile1.m

 [[self.viewModel.refreshCommand.executing deliverOnMainThread] subscribeNext:^(id executing) {
    if ([executing boolValue]) {
        [SVProgressHUD showWithMaskType:SVProgressHUDMaskTypeGradient];
    } else {
        [SVProgressHUD dismiss];
    }
}];
    
@weakify(self);
[[self.viewModel.refreshCommand.errors deliverOnMainThread] subscribeNext:^(NSError *error) {
    [SVProgressHUD dismiss];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Something wrong! >_<" delegate:nil cancelButtonTitle:@"Retry" otherButtonTitles:nil];
    [[alert rac_buttonClickedSignal] subscribeNext:^(id x) {
        @strongify(self);
        [self reload];
    }];
    [alert show];
}];
    
[[[self.viewModel.refreshCommand.executionSignals flatten] deliverOnMainThread]
     subscribeNext:^(NSArray *response) {
     // Create StoryViewModel here
}];