在AppDelegate中打开ViewController,同时保留选项卡栏

首先,您将无法满足TabBarController:

let storyboard = UIStoryboard.init(name: "YourStoryboardName", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "YourTabBarController") as! UITabBarController

然后贪得无厌的 viewControllers UINavigationController ? 如果是这样,您将改为不满足导航控制器:

let first = storyboard.instantiateViewiController(withIdentifier: "YourFirstNavigationController") as! UINavigationController
let second = storyboard.instantiateViewiController(withIdentifier: "YourSecondNavigationController") as! UINavigationController
let third = storyboard.instantiateViewiController(withIdentifier: "YourThirdNavigationController") as! UINavigationController

此外,还应实例化所需的ViewController:

let desiredVC = storyboard.instantiateViewController(withIdentifier: "desiredVC") as! ExampleDesiredViewController

将所有导航控制器设置为 视图控制器 TabBarController的:

tabBarController.viewControllers = [first, second, third]

if tabBarController.selectedViewController == first {

// Option 1: If you want to present
first.present(desiredVC, animated: true, completion: nil)

// Option 2: If you want to push
first.pushViewController(desiredVC, animated. true)

}

将tabBarController设置为 rootViewController :

self.window = UIWindow.init(frame: UIScreen.main.bounds)   
self.window?.rootViewController = tabBarController
self.window?.makeKeyAndVisible()

最后:这是您完成的代码:

func openViewController() {

let storyboard = UIStoryboard.init(name: "YourStoryboardName", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "YourTabBarController") as! UITabBarController

let first = storyboard.instantiateViewiController(withIdentifier: "YourFirstNavigationController") as! UINavigationController
let second = storyboard.instantiateViewiController(withIdentifier: "YourSecondNavigationController") as! UINavigationController
let third = storyboard.instantiateViewiController(withIdentifier: "YourThirdNavigationController") as! UINavigationController

let desiredVC = storyboard.instantiateViewController(withIdentifier: "desiredVC") as! ExampleDesiredViewController

tabBarController.viewControllers = [first, second, third]

if tabBarController.selectedViewController == first {

// Option 1: If you want to present
first.present(desiredVC, animated: true, completion: nil)

// Option 2: If you want to push
first.pushViewController(desiredVC, animated. true)

}

self.window = UIWindow.init(frame: UIScreen.main.bounds)   
self.window?.rootViewController = tabBarController
self.window?.makeKeyAndVisible()

}

如果要在点击通知时显示或推送ViewController?试试这样:

extension AppDelegate: UNUserNotificationCenterDelegate {

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        switch response.actionIdentifier {
        case UNNotificationDefaultActionIdentifier:
            openViewController()
            completionHandler()

        default:
            break;
        }
    }
}

我可以想出两种方法:

1) 如果该视图控制器是UINavigationController,则您可以从任何位置推送配置文件:

if let tabNavigationController = tabbarController.viewControllers?[3] as? UINavigationController {
    tabbarController.selectedViewController = tabNavigationController
    let profileViewController = ProfileViewController(...)
    // ... set up the profile by setting the user id or whatever you need to do ...
    tabNavigationController.push(profileViewController, animated: true)    // animated or not, your choice ;)
}

2) 或者,我喜欢直接从视图控制器子类(在本例中为PostListViewController)控制这些事情。我在swift文件中有这个助手方法,我将其包含在我的所有项目中:

extension UIViewController {
    var containedViewController: UIViewController {
        if let navController = self as? UINavigationController, let first = navController.viewControllers.first {
            return first
        }
        return self
    }
}

然后我会这样做来推动新的视图控制器:

if let tabViewController = tabbarController.selectedViewController {
    tabbarController.selectedViewController = tabViewController
    if let postListViewController = tabViewController.containedViewController as? PostListViewController {
        postListViewController.goToProfile(for: user)    // you need to get the user reference from somewhere first
    }
}

在我上一个live项目中,我使用了与您相同的方法。因此,尽管我怀疑这种方法是否正确或理想地处理来自AppDelegate的推送通知(我在iOS中仍有很多东西需要学习),但我仍在分享它,因为它适合我,而且我相信代码仍然可读且相当干净。

关键是要知道屏幕的级别或堆叠。什么是childViewControllers,最上面的屏幕,最下面的屏幕,等等。。。

然后,如果您现在准备推到某个屏幕,那么您当然需要当前屏幕的navigationController。

例如,此代码块来自我的项目的AppDelegate:

    func handleDeeplinkedJobId(_ jobIdInt: Int) {
        // Check if user is in Auth or in Jobs
        if let currentRootViewController = UIApplication.shared.keyWindow!.rootViewController,
            let presentedViewController = currentRootViewController.presentedViewController {
            if presentedViewController is BaseTabBarController {
                if let baseTabBarController = presentedViewController as? BaseTabBarController,
                    let tabIndex = TabIndex(rawValue: baseTabBarController.selectedIndex) {
                    switch tabIndex {
                    case .jobsTab:
....

....

                    if let jobsTabNavCon = baseTabBarController.viewControllers?.first,
                        let firstScreen = jobsTabNavCon.childViewControllers.first,
                        let topMostScreen = jobsTabNavCon.childViewControllers.last {

...
...

正如你们所见,我知道屏幕的层次结构,通过使用这些知识以及一些耐心来检查我是否在正确的屏幕上 断点 和 printobject (po) ,我得到了正确的参考。最后,在上面的代码中,我有 topMostScreen 引用,如果我想的话,我可以使用该屏幕的navigationController推送到一个新屏幕。

希望这有帮助!