ios - 从 swift 3 中的标签栏移动时如何重新加载页面？

Question

运行应用程序后，我当时在选项卡栏中单击了购物车，购物车中没有添加任何商品，因此显示您的购物车是空的，但在购物车中添加商品后，我还单击了选项卡栏上的购物车图标它像以前一样显示并且购物车页面没有重新加载任何人都可以帮我解决这个问题吗？

我在我的主视图 Controller 中使用了这段代码

func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
        let tabBarIndex = tabBarController.selectedIndex
        if tabBarIndex == 1 {
            let  navController = self.tabBarController?.viewControllers![1] as! UINavigationController
            let secondViewController = navController.viewControllers[0] as! AddToCartViewController
            secondViewController.firstTimeTableSkip = true
            self.tabBarController?.selectedIndex = 1
        }
    }

在我的购物车 View Controller 中我使用了这段代码

override func viewWillAppear(_ animated: Bool) {
        if firstLoginCheck == true {
        checkOutButton.isHidden = false
        checkOutButton.layer.cornerRadius = 5
        if conditonCheck == true || conditonCheck == nil{
        checkOutButton.isHidden = true
        checkOutButton.layer.cornerRadius = 5
        tableDetails.isHidden = true
        emptyView.isHidden = true
        tableDetails.separatorInset = UIEdgeInsets.zero
        loginCheck = UserDefaults.standard.integer(forKey: "CustomerLogin")
        activityIndicator.startAnimating()
        emptyView.isHidden = true
        if loginCheck == 1 {
            let token = UserDefaults.standard.value(forKey: "CustomerLoginToken")
            self.customerKeyToken = token!
            print(self.customerKeyToken!)
            if itemCode != nil {
                self.customerAddToCartItemsDownloadJsonWithURl(cartApi: customerAddtoCartApi)
       customerCartItemsDownloadJsonWithURl(cartApi: customerCartApi)
            }
            else {
                customerCartItemsDownloadJsonWithURl(cartApi: customerCartApi)
            }
        }else if (loginCheck == 0) || (loginCheck == nil) {
            if let token = UserDefaults.standard.value(forKey: "user_token")  {
                self.key = token as? String
                let defaultValue = UserDefaults.standard.value(forKey: "MenuButton") as? String
                if (defaultValue == "Tab" && itemCode == nil) {
                    check = true
           cartCountApiDownloadJsonWithURL(cartCountApi: getCartApi)
                }
            } else {
                gettingKeyFromJsonWithURL(keyApi: keygettingApi)
            }
            if itemCode != nil && key != nil {
                self.PostingKeyFromJsonWithURL(PostingApi: postingKeyApi)
            }
            if key != nil {
                cartCountApiDownloadJsonWithURL(cartCountApi: getCartApi)
                emptyView.isHidden = true
            }
            }
        }

Answer 1

viewWillApear() 方法比使用通知或委托(delegate)或相关的方法更适合重新加载 View 。只需将您想要重新加载的代码放入 viewWillApear()