Initialize a UIView in high resolution for iPhone 4

How can i init a uiview to be in high resolution (640x960) on iphone4? i tried to put a scaleFactor of 2.0 to the uiview but that did nothing also how can i test 开发者_如何学Pythonthat the device the app is running on accept high resolution ie. it is an iphone 4

thanks in advance, Benoit

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It's already done when you launch your app on a iPhone 4.

If you need better image resolution, you need to adjust the size and rename it with @2x at the end.

What are you trying to do ?

Vincent