iPad VGA 输出 - 如何删除多余的 UIScreen
我需要在单独的屏幕上显示特定视图，类似于 Keynotes 处理演示模式的方式。
我通过检查有多少屏幕可用，然后添加我想要显示为第二个窗口的子视图的视图，成功地管理了此操作。
但是，如果我关闭处理子视图创建的父视图，则第二个屏幕永远不会“禁用”，并且视图仍保留在屏幕上。我是否缺少某种形式的 [externalWindow removeSubview] 调用？我在创建它的类的dealloc方法中释放了添加到额外窗口的视图，但不确定应该如何处理额外窗口。
I have the need to display a specific view on a separate screen, similar to how Keynotes handles presentation mode.
I've managed this successfully by checking how many screens are available, and then adding the view I want displayed as a subview of the second window.
However, if I dismiss the parent view that handles the creation of the subview, the second screen is never 'disabled' and the view remains on screen. Is there some form of [externalWindow removeSubview] call that I am missing? I release the view I've added to the extra window in the dealloc method of the class that creates it, but am not sure how i should be handling the extra window.
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我认为外部窗口会保留最后输出的副本，直到您的应用程序（或另一个应用程序）输出新内容。在禁用输出之前尝试清空外部窗口。您可以尝试设置 externalWindow.backgroundColor = [UIColor blackColor] 或在禁用输出之前添加临时黑色 UIView。
祝你好运！
I think the external window keeps a copy of the last output until your app (or another app) outputs something new. Try blanking the external window before disabling output. You can try setting externalWindow.backgroundColor = [UIColor blackColor] or adding a temporary black UIView before disabling output.
Good luck!