保留标签栏时在AppDelegate中打开ViewController [英] Opening ViewController In AppDelegate While Keeping Tabbar

问题描述

在我的Xcode项目中，当用户点击通知时，我想先将其发送到tabBar中的某个项目，然后我要实例化视图控制器并将对象发送到该视图控制器.我有将它们发送到所需的tabBar的代码，但是我不知道如何在将tabBar和导航栏保持与视图控制器连接的同时将它们实例化到视图控制器.关于此问题的所有答案都需要您更改根视图控制器，这使我在调用视图控制器时失去了与tabBar和导航栏的连接.

In my Xcode project when a user taps on a notification I want to first send them to a certain item in my tabBar then I want to instantiate a view controller and send an object over to that view controller. I have code the that sends them to the tabBar I want, but I do not know how to instantiate them to the view controller while keeping the tabBar and navigation bar connected to the view controller. All the answers on this require you to change the root view controller and that makes me lose connection to my tabBar and navigation bar when the view controller is called.

一个真实的例子:用户收到Instagram通知，说约翰开始关注你"->用户点击通知-> Instagram打开并显示通知选项卡->快速将用户发送给约翰"配置文件，然后当用户按下后退"按钮时，会将其发送回通知标签

A Real Life Example of this: User receives Instagram notification saying "John started following you" -> user taps on notification -> Instagram opens and shows notifications tab -> quickly send user to "John" profile and when the user presses the back button, it sends them back to the notification tab

应该知道:之所以要先转到某个选项卡，是因为要使用的视图控制器没有该选项卡，所以要获取该选项卡的导航控制器.

这是我的工作代码，用于将用户发送到通知"选项卡(我添加了评论以像Instagram的示例一样以更好地理解):

Here's my working code on sending the user to "notifications" tab (I added comments to act like the Instagram example for better understanding):

if let tabbarController = self.window!.rootViewController as? UITabBarController {
    tabbarController.selectedViewController = tabbarController.viewControllers?[3] //goes to notifications tab
    if type == "follow" { //someone started following current user                            
        //send to user's profile and send the user's id so the app can find all the information of the user                    
    }
}

推荐答案

首先，您要使TabBarController满意:

First of all, you'll to insatiate a TabBarController:

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

，然后使TabBarController的所有viewControllers都满足.如果您的viewControllers嵌入到UINavigationController中?如果是这样，您将改为使用导航控制器:

And then insatiate all of the viewControllers of TabBarController. If your viewControllers is embedded in to the UINavigationController? If so, you'll to insatiate a Navigation Controller instead:

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，您也应该实例化所需的ViewController:

Also you should instantiate your desired ViewController too:

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

将所有NavigationControllers设为TabBarController的viewControllers:

Make all of the NavigationControllers as viewControllers of TabBarController:

tabBarController.viewControllers = [first, second, third]

然后检查:这取决于您的选择.

And check: It's about your choice.

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设为rootViewController:

Make tabBarController as a 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:

Finally: It's your completed code:

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?尝试类似的事情:

If you want to present or push ViewController when the notification is tapped? Try something like that:

extension AppDelegate: UNUserNotificationCenterDelegate {

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

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

        default:
            break;
        }
    }
}

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