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    <p>Each UIWindow object (basically the top level view) is assigned a screen (UIScreen) and you can of course set the screen you want. Therefore moving the main content to a second screen is easy, but mirroring is hard. (If you don't want a lecture on why it's ugly skip until the next paragraph) I believe this is apple's intention, both because drawing the same thing twice, one with a MUCH higher resolution, and because the experience of watching the interface before entering whatever presentation mode is rather subpar in comparison to seeing nothing until the video is playing, keynote presentation has started, etc. This is something you obviously want to consider on a case by case basis, but nonetheless mirroring is a Bad Idea.</p> <p>UIWindow inherits from UIView, so although I don't have much personal experience with this exact thing, you should still be able to get it to draw to a bitmap context of some kind, and then use two different UIWindows each with only an image view on a them pushing the actual pixels to their respective screens. This is considerably easier if you only want to mirror one specific custom view (and not including it's subviews) because you can have that view on the device screen, (to capture any input) and then design it in a way that you have a method to call to draw it in whatever context it's in (some drawRects might work fine as is) and the call that from a super special awesome custom subview on the other screen, which would implement drawRect to just call the method on the actual view.</p> <p>Hope this helps, sorry I ranted a bit :(</p>
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    1. POiPad VGA Connector - Mirror screen in own Application?
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    1. COWhy do you say "one with a MUCH higher resolution"? I just hooked to a projector yesterday and it defaults to 1024x768 which is the same as the iPad. I wish by default it mirrored unless your app decided to display something else on the external. It would be really sweet for showing off application concepts.
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    2. COWhile I agree that it would be cool for showing off the apps, keep in mind that apple doesn't think thats what people are going to be using this for primarily :P However, if you don't mind not seeing the screen on the iPad when its hooked up to an external display, its really easy to move the main UIWindow to the other UIScreen -- http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIScreen_Class/Reference/UIScreen.html
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    3. CODoes it works on the simulator 4.2?? I've tried using this code on simulator with T.V out..but nothing shows up.. :(
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