Recipe: Using External Screens
There are many ways to use external screens. Take the newest iPads, for example. The second-, third-, and fourth-generation models offer built-in screen mirroring. Attach a VGA or HDMI cable, and your content can be shown on external displays and on the built-in screen. Certain devices enable you to mirror screens wirelessly to Apple TV using AirPlay, Apple’s proprietary cable-free over-the-air video solution. These mirroring features are extremely handy, but you’re not limited to simply copying content from one screen to another in iOS.
The UIScreen class enables you to detect and write to external screens independently. You can treat any connected display as a new window and create content for that display separate ...
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