iOS 判断UIViewController是push/pop或模态化进入/退出

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        if isBeingPresented || isMovingToParent {
            if isBeingPresented {
                print("页面通过模态化present进入该页面")
            }
            
            if isMovingToParent {
                print("页面通过导航栏push进入该页面")
            }
            
        } else {
            print("页面通过导航栏pop退回该页面 / 页面通过模态化dismiss退回该页面")
        }
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        if isBeingDismissed || isMovingFromParent{
            if isBeingDismissed {
                print("页面通过模态化dismiss退出该页面")
            }
            
            if isMovingFromParent {
                print("页面通过导航栏pop退出该页面")
            }

        } else {
            print("页面通过导航栏push出该页面 / 页面通过模态化present退出该页面")
        }
    }