ios - Terminating app due to uncaught exception reason: 'Application windows are expected to have a root view controller at the end of application launch' -

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feedcontentvc *feedvc= [[feedcontentvc alloc] initwithnibname:@"feedcontentvc" bundle:nil]; navigationcontroller = [[uinavigationcontroller alloc] initwithrootviewcontroller:feedvc];  navigationcontroller.navigationbar.barstyle = uibarstyleblack;  [window setrootviewcontroller:navigationcontroller];

although things looks correct in doing, please confirm following:

  1. window strong property in appdelegate. should [self.window setrootviewcontroller:navigationcontroller].
  2. put breakpoint , check feedvc not nil.
  3. you have statement in code [self.window makekeyandvisible];.

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