有的時(shí)候碰到detail頁(yè)需要隱藏navigation bar的需求. 此時(shí)可用setNavigationBarHidden方法來(lái)設(shè)置. 如下:

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationController?.setNavigationBarHidden(true, animated: animated)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        self.navigationController?.setNavigationBarHidden(false, animated: animated)
    }

用setNavigationBarHidden方法時(shí)push和pop操作過(guò)度平滑. 但是發(fā)現(xiàn)側(cè)滑退出功能已無(wú)效.

此時(shí)我們可以重寫如下方法gestureRecognizerShouldBegin.

1. 在class上加上UIGestureRecognizerDelegate.
2. 設(shè)置 navigationController?.interactivePopGestureRecognizer?.delegate = self
3. 增加如下函數(shù):

    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if(navigationController!.viewControllers.count > 1){
            return true
        }
        return false
    }