UIView alpha = 0 导致触摸被拖放到下面的视图 [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一个自定义 UIView 来处理触摸.这个玻璃窗格位于其他视图之上，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拦截.这是错误的.但是，当我将 alpha 设置为 0.2 之类的低值时，玻璃窗格会拦截触摸.

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 设置是在 Interface Builder 中完成的.

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，您可以设置该 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 - 我假设您想要这样做?

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

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