通过兄弟子视图传播触摸事件？ [英] Propagating touch events through sibling subviews?

问题描述

我有一堆子视图，都有用户交互部分（子）和全屏。问题是，如果我触摸堆栈顶部的非交互式部分，它将不会将该触摸传播到堆栈的其余部分。我的设置：

I've got a stack of subviews that are all have user interactive sections (children) and all full screen. The problem is that, if I touch down on a non-interactive section at the top of the stack, it won't then propagate that touch across the rest of the stack. My setup:

查看A
- 查看B（全屏容器，本身不是交互式但具有交互式子视图）
---- view B1（互动）
----查看B2（互动）
- 查看C（与B相同）
----查看C1（互动）
--- -view C2（交互式）

view A --view B (full screen container, not itself interactive but has interactive subviews) ----view B1 (interactive) ----view B2 (interactive) --view C (same as B) ----view C1 (interactive) ----view C2 (interactive)

B和C都是全屏，但B1 / B2 / C1 / C2只是屏幕的一小部分。

B and C are both full screen, but B1/B2/C1/C2 are only small sections of the screen.

[a addSubview:b];
[a addSubview:c];

如果我触摸C1 / C2以外的任何东西，我想触摸事件然后检查是否它击中了B（B1 / B2）内的任何地方，但它只是回到A，然后回到A的父母。是否有可能做到这一点？如果我在C上设置了userInteractionEnabled NO，但在C1 / C2上设置为YES，它也没有得到任何内部调用，尽管在这种情况下B会按预期得到触摸。

If I touch anything outside of C1/C2, I'd like the touch event to then check if it hit anywhere inside of B (B1/B2), but instead it just goes back to A, and then to A's parent. Is it possible to do this? If I set userInteractionEnabled NO on C but YES on C1/C2, it doesn't get any calls to the inner ones either, although in this case then B would get the touches, as expected.

编辑：结束遍历视图堆栈以仅检查某些子视图而不是所有子视图：

edit: Ended up traversing the view stack manually to check only for certain subviews and not all of them:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {

    if (self != self.topCustomViewsContainer) {     
        for (UIView *v in self.createdSubviews) {
            CGPoint newPoint = point;
            newPoint.x -= v.frame.origin.x;
            newPoint.y -= v.frame.origin.y;
            UIView *hit = [v hitTest:newPoint withEvent:event];
            if (hit)
                return hit;
        }
        return nil;

    }

    return [super hitTest:point withEvent:event];
}

推荐答案

一种可能性是覆盖

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event

视图B中的方法。只有在击中B的子视图时才能返回。试试这样：

method in view B. You can make it return only if a subview of B is hit. Try it like this:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
  UIView *hitView = [super hitTest:point withEvent:event];
  if (hitView == self) {
    return nil;
  } else {
    return hitView;
  }
}

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