以编程方式创建的按钮不适用于子视图

Question

所以我试图创建一个模拟条形的自定义类，当点击时，展开以显示额外信息，然后再次点击，折叠并隐藏它。我还放入代码，以便它可以接受自己的子视图。一切正常，除了按钮不适用于子视图。知道为什么吗？以下是我的代码。

初始代码

- (void)initHeader {
    UIButton *animateButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [animateButton setFrame:CGRectMake(20, 20, 150, 20)];
    [animateButton addTarget:self action:@selector(animateView:) forControlEvents:UIControlEventTouchUpInside];
    [animateButton setTitle:@"ANIMATE LA" forState:UIControlStateNormal];

    self.clipsToBounds = NO;

    clippedView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 280, 0)];
    clippedView.clipsToBounds = YES;

    UILabel *label = [[UILabel alloc] init];
    [label setText:@"EXTRA INFO"];
    [label setFrame:CGRectMake(20, 150, 150, 20)];

    [clippedView setBackgroundColor:[UIColor whiteColor]];
    [clippedView addSubview:label];

    [self addSubview:animateButton];
    [self addSubview:clippedView];
}

// The code to add children

- (void)addChildComboView {

    if (childView == nil) {
        CGRect frame = CGRectMake(0, 100, baseWidth, 100);
        childView = [[LAComboInfoView alloc] initWithFrame:frame];

        [self initChildVars];
        [self addSubview:childView];
    }
    else {
        [childView addChildComboView];
    }

}

// The code that runs when the button is pressed. All the frames are preset in another method which I will not post because it's basically just initialization.

- (IBAction)animateView:(id)sender {

    /*
    [UIView animateWithDuration:0.3f delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
        self.myButton.frame=SET_YOUR_FRAME;
    } completion:^(BOOL finished)];
    */

    if (x == 0) {
        [self setFrame:expandedFrame];
        [childView setFrame:expandedChildFrame];
        [clippedView setFrame:expandedClippedViewFrame];

        x = 1;
        NSLog(@"Expanded");
    }
    else {
        [self setFrame:collapsedFrame];
        [childView setFrame:collapsedChildFrame];
        [clippedView setFrame:collapsedClippedViewFrame];

        x = 0;
        NSLog(@"Collapsed");
    }
}

// What's called on the code

    LAComboInfoView *champOneView = [[LAComboInfoView alloc] initWithFrame:frame];
    [champOneView setBackgroundColor:physicalColor];

    [champOneView addChildComboView];
    [_scroller addSubview:champOneView];

以下是两张图片，第一张是启动外观，第二张是按下按钮后。

除了childView按钮（白色方块）不起作用外，工作正常。

tl; dr：代码中的某些内容会导致儿童观看按钮无法正常工作。