ios - Navigating from one viewController to another -

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i have problem in app related navigation.my app consists of initial configurationvc, loginvc , after logging in landingvc. after logging in if anywhere in app, user encounters condition 'invalid id' need take him configuration controller.everywhere have handled keeping common navigation controller begins configurationvc , using poptorootviewcontroller on encountering 'invalid id'. on landingvc open leavevc in different navigation cntroller.i doing need present leavevc modally in formsheet style on landing page. if poptorootviewcontroller wont directly navigate configurationvc. should directly configurartion screen in case. have searched few links wasnt able adzact solution. kindly help, newbie ios

you can have configurationvc , loginvc seperate navigationcontrollers. when ever want configurationvc change application window rootviewcontroller configurationvc.


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