子视图中的手势识别器出现问题

我遇到了一个相当基本的问题，我环顾四周(在这里，谷歌等)，但没有找到解决方案:

I'm having a rather basic problem, I've looked around (here, google, etc) and haven't found a solution for this:

在我的视图控制器的 viewDidLoad 中，我有这个:

In my View Controller's viewDidLoad, I have this:

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(myfunc:)];

//I have a UIScrollView named "containerView"
//here's some code that creates an UIView in a variable named "myView"

//this works fine, I can see "myView" when I run it
[containerView addSubview:myView];

[myView addGestureRecognizer:longPress];

然后我在同一个类中有这个函数:

and then I have this function in the same class:

- (void)myfunc:(UIRotationGestureRecognizer *)recognizer 
{
    NSLog(@"hola!"); //never runs
}

对 NSLog 的调用永远不会运行.我做错了什么?

The call to NSLog never runs. What am I doing wrong?

编辑

一些额外的信息:似乎没有任何触摸事件发送到子视图.但是，我尝试添加一个带有按钮的 UIView，全部在 UIScrollView 中，并且按钮接收触摸事件就好了，所以问题仅在于以编程方式添加的子视图.

Some extra info: it seems no touch events are ever sent to the subview. However, I tried adding an UIView with a button inside, all in the UIScrollView, and the button receives the touch event just fine, so the problem is only with programmatically added subviews.