ios - What happens to View Controllers when iPhone is rotated? -

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working on app, i'm running across problem causing app shut down without error messages. can't find wrong code, , happens when chain of events occur.

here's happens: under navigation controller, if go @ least 2 views in, rotate iphone landscape, attempt go back, app crashes immediately. i've added debug nslog lines me understand problem, revealing view controllers not working thought did.

when rotate phone (simulator), views in stack become notified of change? , can shed light why might causing crash? thanks!


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