UIViewController UIButton can't touch

i have two UIViewController, A & B

[A addSubView: B.view];

it's ok.

but i got an question, i can't get the B's UIButton Touch Event after [A addSubView: B.view] why?

is anyone can help me thank you~

Here's my some code :

A View:

CellAction_ViewController *cellActionViewController = [[CellAction_ViewController alloc] initWithNibName:@"CellAction_ViewController" bundle:nil];

[cell.contentView addSubview:cellActionViewController.view];
[cellActionViewController.button_like addTarget:self
                                         action:@selector(Likes_Button:)
                               forControlEvents:UIControlEventTouchUpInside];

cell.selectionStyle = UITableViewCellSelectionStyleNone;

B View:

- (void)viewDidLoad {
[super viewDidLoad];

// bala bala ...
   [_button_like setClipsToBounds:YES];
}