在保持Tabbar的同时在AppDelagate中打开ViewController

Question

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视图控制器并将一个对象发送到该视图控制器.我有代码将它们发送到我想要的tabBar,但我不知道如何将它们实例化到视图控制器,同时保持tabBar和导航栏连接到视图控制器.所有答案都要求您更改根视图控制器,这会使我在调用视图控制器时失去与tabBar和导航栏的连接.

真实生活示例:用户收到Instagram通知,说"John开始关注你" - >用户点击通知 - > Instagram打开并显示通知标签 - >快速将用户发送到"John"个人资料,当用户按下后退按钮时,它将它们发送回通知选项卡

应该知道:我之前要去某个标签的原因是为了获得该标签的导航控制器,因为我将要使用的视图控制器没有.

这是我将用户发送到"通知"标签的工作代码(为了更好地理解,我添加了评论以像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                    
    }
}

Answer 1

首先,你要发布一个TabBarController:

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

然后给所有viewControllers的TabBarController 充电.如果你的viewControllers被嵌入到UINavigationController？如果是这样,您将改为使用导航控制器:

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,您还应该实例化您想要的ViewController:

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

viewControllers从TabBarController生成所有NavigationControllers :

tabBarController.viewControllers = [first, second, third]

并检查:这是你的选择.

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设为rootViewController:

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

最后:这是你完成的代码:

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？尝试类似的东西:

extension AppDelegate: UNUserNotificationCenterDelegate {

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

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

        default:
            break;
        }
    }
}