如何在標簽欄控制器上使用高級導航

我有TabBarController5 個選項。第一個 TabBarItem 是 HomeScreen，第二個是帶我進入深度導航作業流程。當我在最后一個ViewController深度導航時，我有一個Save按鈕，當我單擊它時，我想將用戶發送回 HomeScreen。問題是我所有的圖示都TabBarController消失了。我嘗試了另一種解決方案，但是對于該解決方案，我的圖示正在顯示，但是當我單擊第二個時，我TabBarItem會看到該深度導航作業流程的最后一個螢屏。這是我的專案：https ://github.com/AdvancedNavigationTabBarController 這是我的代碼：

第一個標簽欄專案

class HomeVC: UIViewController {
    
    @IBOutlet var textfieldHoldingScootersValue: UITextField!
    @IBOutlet var textfieldHoldingBicyclesValue: UITextField!
    
    var valueForScootersScreen = String()
    var valueForBicyclesScreen = String()
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        print("Selected index: \(self.tabBarController?.selectedIndex ?? -1)")
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        
        valueForScootersScreen = textfieldHoldingScootersValue.text ?? String()
        valueForBicyclesScreen = textfieldHoldingBicyclesValue.text ?? String()
        
        if let navController = self.tabBarController?.viewControllers?[1] as? UINavigationController{
            if let scootersTab = navController.children.first as? BuyNewScooterOrBikeVC{
                scootersTab.receivedValueFromHomeScreen = valueForScootersScreen
            }
        }
        
        if let navController = self.tabBarController?.viewControllers?[2] as? UINavigationController{
            if let bicyclesTab = navController.children.first as? BuyNewScooterOrBikeVC{
                bicyclesTab.receivedValueFromHomeScreen = valueForBicyclesScreen
            }
        }
}

第二個標簽欄專案

class BuyNewScooterOrBikeVC: UIViewController {
    
    @IBOutlet var receivedValueLabel: UILabel!
    
    var receivedValueFromHomeScreen = String()
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        print("Selected index: \(self.tabBarController?.selectedIndex ?? -1)")
        
        if self.tabBarController?.selectedIndex == 1 {
            receivedValueLabel.text = "Value received for Scooters: \n"   receivedValueFromHomeScreen
            self.navigationItem.title = "Buy a Scooter"
        }

        if self.tabBarController?.selectedIndex == 2 {
            receivedValueLabel.text = "Value received for Bicycles: \n"   receivedValueFromHomeScreen
            self.navigationItem.title = "Buy a Bicycle"
        }
    }
}

第二個標簽欄專案的最后一個視圖控制器

class ScooterOrBikeLastVC: UIViewController {

    @IBAction func saveBtnTapped(_ sender: UIButton) {
        
        // Navigate to Home Screen
        // self.parent?.navigationController?.popToRootViewController(animated: true) // if I use this line then when I click on the same Tab Bar is sending me to the last screen and I want to be on the first screen of that navigation workflow
        self.navigationController?.popToRootViewController(animated: true) // If I use this line when I click Save btn I don't see anymore the icons on Tab Bar Controller
        self.tabBarController?.selectedIndex = 0
    }
}

感謝您閱讀本文！

uj5u.com熱心網友回復：

在彈出到 root 之前將 tabIndex 設定為 0。

self.tabBarController?.selectedIndex = 0
self.navigationController?.popToRootViewController(animated: true)

// class ScooterOrBikeLastVC // self.parent?.navigationController?.popToRootViewController(animated: true) // 這行什么都不做，因為父級是 nil 為什么你會得到 Home 選項卡？因為您已將標簽欄設定為 0 self.tabBarController?.selectedIndex = 0

當您希望撰寫生產代碼時，您應該考慮更好的方式在控制器之間進行通信。在您當前的方法中，任何控制器都可以訪問和修改另一個。

標籤：

上一篇：UserDefaults.standard中的兩種方法

下一篇：在SwiftUI中顯示異步Api呼叫的狀態