在我的 Xcode 项目中，当用户点击通知时，我想首先将它们发送到我的 tabBar 中的某个项目，然后我想实例化一个 View Controller 并将一个对象发送到该 View Controller 。我有将它们发送到我想要的 tabBar 的代码，但我不知道如何在保持 tabBar 和导航栏连接到 View Controller 的同时将它们实例化到 View Controller 。关于这个的所有答案都要求您更改 Root View Controller ，这让我在调用 View Controller 时失去与我的 tabBar 和导航栏的连接。

现实生活中的例子:用户收到 Instagram 通知说“John 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“John "配置文件，当用户按下后退按钮时，它会将它们发送回通知选项卡

应该知道:我之所以首先转到某个选项卡是为了获取该选项卡的导航 Controller ，因为我将要转到的 View Controller 没有导航 Controller 。

这是我将用户发送到“通知”选项卡的工作代码(为了更好地理解，我添加了评论来像 Instagram 示例一样):

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                    
    }
}

最佳答案

首先，您需要设置一个 TabBarController:

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

然后填满 TabBarController 的所有 viewControllers。如果您的 viewControllers 嵌入到 UINavigationController 中？如果是这样，您将转而使用导航 Controller :

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

你也应该实例化你想要的 ViewController:

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

将所有 NavigationController 设为 TabBarController 的 viewControllers:

tabBarController.viewControllers = [first, second, third]

然后检查:这是关于您的选择。

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 作为 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()

}

如果你想在点击通知时呈现或推送 ViewController？尝试这样的事情:

extension AppDelegate: UNUserNotificationCenterDelegate {

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

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

        default:
            break;
        }
    }
}

关于ios - 在保持 Tabbar 的同时在 AppDelegate 中打开 ViewController，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47129527/