title: Show login dialog on application resume in iOS
body: <p>I'm fairly new to iOS development and have an application that requires a login each time you launch the application.  Obviously, the default behavior when resuming the application is to return to the last open view.  I do want this behavior but I need the user to authenticate first and then return them to the last open view so that they can continue their work.  I have seen other applications do this.  Can anyone give me a pointer on the best way to implement this?</p>