问题描述
我正在处理一个Cocoa应用程序，我遇到了一种情况，我想有两个NSView对象重叠。我有一个父NSView包含两个子视图（NSView A和NSView B），每个都可以有自己的几个子视图。
I'm working on a Cocoa application, and I've run into a situation where I would like to have two NSView objects overlap. I have a parent NSView which contains two subviews (NSView A and NSView B), each of which can have several subviews of their own.
有一个正确的方法来处理这种重叠？ NSView B将始终在高于NSView A上，因此我想要遮蔽NSView A的重叠部分。
Is there a proper way to handle this kind of overlap? NSView B would always be "above" NSView A, so I want the overlapped portions of NSView A to be masked out.
推荐答案
如果你的应用程序只有10.5，打开视图的图层，它应该工作。
If your application is 10.5-only, turn on layers for the views and it should just work.
如果您的意思是支持10.4及以下版本，您需要找到一种不让视图重叠的方法，因为重叠的同级视图是未定义的行为。正如视图编程指南所说：
If you're meaning to support 10.4 and below, you'll need to find a way not to have the views overlap, because overlapping sibling views is undefined behavior. As the View Programming Guide says:
我看到一些黑客可以使它有时工作，但它不是什么你可以依靠。您需要将视图A作为视图B的子视图，或者创建一个处理其两项职责的大视图。
I've seen some hacks that can make it kinda work sometimes, but it's not anything you can rely on. You'll need to either make View A a subview of View B or make one giant view that handles both of their duties.
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