ios - Why is there functional difference between Swipe to pop view controller and poping view controller Programmatically? -

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when swipe right pop view controller/click button on navigation bar viewwillappear code called ,but , when programmatically call [self.navigationcontroller popviewcontrolleranimated:yes]; , behaves differently , first viewdidload called , viewwillappear called . how can achieve behaviour in 1st case using code ?


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