从 TabBarController 呈现特定的 ViewController

Question

我想在触发 本地通知 并执行自定义操作时从 TabBarController 打开特定的 ViewController。我使用了以下行 code:

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

    switch response.actionIdentifier {
    case "first":
        DispatchQueue.main.async(execute: {
            self.first()
        })
    case "second":
        DispatchQueue.main.async(execute: {
            self.second()
        })
    default:
        break
    }


    completionHandler()
}

所以这是一个 first() 函数:

 func first() {


    let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
    let tabBarController = storyboard.instantiateViewController(withIdentifier: "Root") as! UITabBarController
    let navigationController = storyboard.instantiateViewController(withIdentifier: "First") as! UINavigationController

    tabBarController.present(navigationController, animated: true) { 

    }

    self.window = UIWindow.init(frame: UIScreen.main.bounds)
    self.window?.tintColor = UIColor(red: 0.0, green: 0.5, blue: 0.0, alpha: 1.0)
    self.window?.rootViewController = tabBarController
    self.window?.makeKeyAndVisible()

}

第二个函数：second()

func second() {


    let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
    let tabBarController = storyboard.instantiateViewController(withIdentifier: "Root") as! UITabBarController
    let navigationController = storyboard.instantiateViewController(withIdentifier: "Second") as! UINavigationController

    tabBarController.present(navigationController, animated: true) {

    }

    self.window = UIWindow.init(frame: UIScreen.main.bounds)
    self.window?.tintColor = UIColor(red: 0.0, green: 0.5, blue: 0.0, alpha: 1.0)
    self.window?.rootViewController = tabBarController
    self.window?.makeKeyAndVisible()

}

它运行良好，但我无法打开第二个 ViewController，而第一个出现并且第二个 notification 被触发：在控制台中：警告尝试呈现 ViewController...

Answer 1

使用这个：

tabBarController.selectedIndex = 1

或者这样：

tabBarController.selectedViewController = tabBarController.viewControllers![1]

其中 1 可以是您的 tabBarController

提供的任何 viewcontrollers

Answer 2

我运行遇到了类似的问题，更改 selectedIndex 对我不起作用。根据项目的要求，您可以 实例化 您的 ViewController 并将其添加为 Subview 并移动到那个 Subview。完成后确保删除 Subview.

let replyView = self.storyboard?.instantiateViewControllerWithIdentifier("replyView")
    self.addChildViewController(replyView!)
    self.view.addSubview(replyView!.view)
    replyView!.didMoveToParentViewController(self)

从 TabBarController 呈现特定的 ViewController

Present a specific ViewController from the TabBarController

uitabbarcontroller

uinavigationcontroller

uistoryboard

swift

unusernotificationcenter