Setting Up Video Out
After retrieving an external screen object from the [UIScreens screens] array, query the available modes and select a size to use. As a rule, you can get away with selecting the last mode in the list to always use the highest possible resolution or the first mode for the lowest resolution.
To start a Video Out stream, create a new UIWindow and size it to the selected mode. Add a new view to that window for drawing. Then assign the window to the external screen and make it key and visible. This orders the window to display and prepares it for use. After you do that, make the original window key again. This allows the user to continue interacting with the primary screen. Don’t skip this step. Nothing makes end users crankier ...
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