ios swift 判断uiviewcontroller时push present 进来的 还是pop进来的

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override func viewWillAppear(_ animated: Bool) {         super.viewWillAppear(animated)         //显示navbar         self.navigationController?.setNavigationBarHidden(false, animated: true)                   if(isBeingPresented || isMovingToParent){             print("======push")         }else{             print("======pop")         }     }