UIView alpha = 0会将触摸删除到下面的视图中 [英] UIView alpha = 0 causes touches to be dropped to the view below

问题描述

所以我创建了一个玻璃窗格或自定义UIView来处理触摸。此玻璃窗格位于其他视图的顶部，例如虚拟UIButton。当我将alpha设置为0时，触摸实际上会被玻璃视图下方的视图截获。这是错的。但是，当我将alpha设置为0.2这样的低值时，玻璃窗格会截取触摸。

So I created a glass pane or a custom UIView to handle touches. This glass pane sits on top of other views such as dummy UIButtons. When I set the alpha to be 0, the touches actually get intercepted by the views underneath the glass view. This is wrong. However, when I set the alpha to a low value like 0.2, the glass pane intercepts the touches.

alpha设置在Interface Builder中完成。

The alpha setting was done in Interface Builder.

任何人都知道如何将alpha设置为0并且仍然可以让这个玻璃窗格拦截触摸？

Anybody know how to set to the alpha to 0 and still get have this glass pane intercept touches?

推荐答案

是的，这是标准行为。

例如，你可以设置那个 UIView的清晰背景：

For example, you can just set clear background of that UIView:

UIView *touchHandlerView;
touchHandlerView.backgroundColor = [UIColor clearColor];

在这种情况下，用户不会看到该视图 - 我认为你想要做到这一点？

In such case user wouldn't see that view - I assume that you want to do exactly that?

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