This problem happened on my iOS app, as the figure showed. The screen Orientation didn't match with my app. Is there any way I can look at? Where should I look up for this kind of problem? Thanks.
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If you define your window in a xib file, make sure the "Full Screen At Launch " checkbox is checked for that window in the settings inspector. Also, if you;r app launches into landscape you should create the window in code or migrate to a storyboard as there are bugs with xib files + launching to landscape.
Beyond that, possible explanations are that you're doing silly things such as modifying view transforms or spawning secondary windows.

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Hi, my app is based on EAGLView. And I am sure that the xib file's setting is fine. The content on the screen is not just "Full Screen", but also ROTATED. How is that happened? I am using glviewport(0,0,960,640) as long as the Orientation set to be Landscape. – dixiedude Jan 27 '15 at 13:02
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Well, it turned out I had came across an error"Application windows are expected to have a root view controller at the end of application launch" error. Fixed it by the method of Applications are expected to have a root view controller at the end of application launch.