combining flipsideview and navigationview

when i am trying to combine flipsideview and navigation view i am getting following error "request for member 'delegate' is something not in a structure or union" on the line controller.delegate = s开发者_如何学Pythonelf;

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In your view controller's implementation, you can set the delegate of the UINavigationController through the property navigationController:

controller.navigationController.delegate = self;

This assumes that your view controller implements the UINavigationControllerDelegate protocol.

Also, I have found that it is easier to handle functionality related to view switching in viewWillAppear: and viewWillDisappear: rather than implementing the above navigation protocol.