On the webview addsubView imageView imageView can't response gesture

On the webView addSubView an imageView, imageView interactive open, add gestures to the imageView events, has been no response, is the problem?

    UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick)];
    [_danView addGestureRecognizer:tap];
    [self addSubview:_danView];
    [self animationWithView:_danView];

// self is webView