通过UITabBarController让目标VC知道当前VC是委托的

2024-05-15 • 问答

我正在尝试将 destinationVC 的 currentVC 设置为 delegate ，该导航将通过 UITabBarController ，并嵌入到 UINavigationController 中。

我不能将当前的VC设置为委托，因为 prepareForSegue 永远不会触发，并且提供的其他解决方案也不起作用（底部代码）。

所有这些都通过 Interface-builder

设置为 Storyboards

这是架构：

-> UITabBarController


-> UINavigationController


-> currentVC（将其设置为委托）


-> UINavigationController


-> destinationVC

这什么都不做：

override func prepare(for segue: uistoryboardSegue,sender: Any?) {

   print ("The Segue was triggered")
   let destinationVC = segue.destination as! MyViewController
   destinationVC.delegate = self

}

我也无法使它正常工作（它永远不会通过IF语句）：

override func viewDidLoad() {
        super.viewDidLoad()

        if let myDestinationVC = (self.tabBarController?.viewControllers![0] as? UINavigationController)?.viewControllers[0] as? destinationVC {
            print ("The IF statement was triggered")
            myDestinationVC.delegate = self
        }
}

我有一个用于TabBarController的自定义类，该类现在实际上并没有执行任何操作-我不确定是否需要在上面的代码中引用它？

class MyTabBarViewController: UITabBarController,UITabBarControllerDelegate { // Replace with your sending view controller class's type var sendingViewController: SendingViewController? override func viewDidLoad() { super.viewDidLoad() self.delegate = self // Iterate all view controllers to make sure they are instantiated and // get reference to the sendingViewController viewControllers?.forEach { if let navigationController = $0 as? UINavigationController { // Replace with the type of your sending view controller if let sendingViewController = navigationController.topViewController as? SendingViewController { self.sendingViewController = sendingViewController } } } } func tabBarController(_ tabBarController: UITabBarController,didSelect viewController: UIViewController) { if let navigationController = viewController as? UINavigationController { // Replace with the type of your receiving view controller if let receivingViewController = navigationController.topViewController as? ReceivingViewController,let sendingViewController = sendingViewController { // Perform actions here receivingViewController.view.backgroundColor = sendingViewController.view.backgroundColor } } } }

通过UITabBarController让目标VC知道当前VC是委托的

asdqq 回答：通过UITabBarController让目标VC知道当前VC是委托的

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