Why subview controller did not load when assign it to a parent view?

Question

I am trying to add a table view as a subview of a normal view. However, I need complex control of the table view. Here are my related codes:

// In ParentViewController.m
- (void)viewDidLoad
{ 
    _mytbvc= [[TableViewController alloc] init];
    _mytbvc.tableView = self.tableview;
    // 1 Way I tried:
    [self addChildViewController:_mytbvc];
    [self.view addSubview:_mytbvc.tableView];
    [_mytbvc didMoveToParentViewController:self];
    // Another way I tried
//    self.tableview.delegate = _mytbvc;
//    self.tableview.dataSource = _mytbvc;
//    self.textfield.delegate = self;
    [super viewDidLoad];
}


//In TableViewController.m
- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog(@"table view loaded");
    if (_messages == nil){
        _messages = [[NSMutableArray alloc] init];
    }
    [self setEditing:true];
    [self setEditing:true];
    NSLog(@"%lu", _messages.count);
}

The problem I found currently is that the program does not even run the viewDidLoad method in TableViewController. Any idea which part might be wrong? What should I look into?