Swift: 如何关闭从 AppDelegate 启动的视图控制器和导航控制器

Question

我的应用 iOS 主框架在 TabBarController 上运行。无论如何，当通知到达时会有一个额外的行为。当收到推送通知时，我的应用会执行以下操作：

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
    //application.applicationIconBadgeNumber = 0
    //application.cancelAllLocalNotifications()
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let notificationController = storyboard.instantiateViewControllerWithIdentifier("DynamicEventsViewController") as! DynamicEventsViewController
    notificationController.isLoadedFromNotification = true
    notificationController.eventTitle = userInfo["aps"]!["alert"] as! String
    notificationController.eventDescription = userInfo["aps"]!["message"] as! String
    let navigationController = UINavigationController()
    navigationController.pushViewController(notificationController, animated: true)
    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
    window!.rootViewController = navigationController
    self.window?.makeKeyAndVisible()

}

这是相关实例化视图控制器的代码：

class DynamicEventsViewController:UIViewController {

@IBOutlet weak var upDistanceConstraint: NSLayoutConstraint!
@IBOutlet weak var dynamicEventTitle:UITextField!
@IBOutlet weak var dynamicEventDescription:UITextView!

var eventTitle:String? = nil
var eventDescription:String? = nil

var isLoadedFromNotification = false


override func viewDidLoad() {
    super.viewDidLoad()

        self.navigationItem.titleView = UIImageView(image: UIImage(named: "icons/bar.png"))
        self.navigationController?.navigationBar.barTintColor = UIColor.whiteColor()

        if (self.navigationItem.leftBarButtonItem == nil) {
            let leftButton = UIBarButtonItem(title: "Chiudi", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(DynamicEventsViewController.back(_:)))
            self.navigationItem.leftBarButtonItem = leftButton
        }

    if (self.eventTitle != nil && self.eventDescription != nil) {
        self.dynamicEventTitle.text = self.eventTitle?.uppercaseString
        self.dynamicEventDescription.text = self.eventDescription
    }
}

func back(sender: UIBarButtonItem) {
  self.navigationController?.popViewControllerAnimated(true)
}

}

无论如何，如果我点击 "Chiudi" 按钮，视图控制器不会关闭，而我希望应用程序返回到 TabBarController。哪种方法正确？

最终解决方案

从AppDelegate.swift到didReceiveLocal(Remote)Notification()我执行：

let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let notificationController = storyboard.instantiateViewControllerWithIdentifier("DynamicEventsViewController") as! DynamicEventsViewController
    notificationController.isLoadedFromNotification = true
    notificationController.eventTitle = userInfo["aps"]!["alert"] as? String
    notificationController.eventDescription = userInfo["aps"]!["message"] as? String
    notificationController.isLoadedFromNotification = true

    if let tabBarController = self.window?.rootViewController {
        tabBarController.presentViewController(notificationController, animated: true, completion: nil)
    }

在我的视图控制器中我执行：

if (isLoadedFromNotification) {
        self.upDistanceConstraint.constant = 90

        let navigationBar:UINavigationBar = UINavigationBar(frame: CGRectMake(0, 0, self.view.frame.size.width, 80))
        navigationBar.backgroundColor = UIColor.whiteColor()

        let navigationItem:UINavigationItem = UINavigationItem()

        let leftButton:UIBarButtonItem = UIBarButtonItem(title: "Chiudi", style: .Plain, target: self, action: #selector(DynamicEventsViewController.exit(_:)))

        navigationItem.titleView = UIImageView(image: UIImage(named: "icons/bar.png"))
        navigationItem.leftBarButtonItem = leftButton
        self.navigationItem.titleView = UIImageView(image: UIImage(named: "icons/bar.png"))

        navigationBar.items = [navigationItem]

        self.view.addSubview(navigationBar)

}

其中 self.upDistanceConstraint 是一个 NSLayoutConstraint 表示栏和我的视图控制器中的第一个小部件之间的距离，在我的例子中，它是一个 UITextField 否则它会是隐藏在酒吧里。

Answer 1

您可以创建导航控制器，但不要用它替换您的根控制器。只需在没有动画的情况下从您的标签栏控制器中呈现它。当您需要从通知中隐藏导航控制器时，只需将其关闭：

func showNavigation(){
    tabBarController.presentViewController(navController, animated: false) {  
    }
}

func hideNavigation() {
    tabBarController.dismissViewControllerAnimated(true) {
    }
}

tabBarController 是你的 window?.rootViewController

已更新

而不是

self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
window!.rootViewController = navigationController
self.window?.makeKeyAndVisible()

试试这个

rootTabBarController.presentViewController(navigationController, animated: true) {}

Answer 2

当您收到通知时，您的 TabBarController 已经是您应用程序的 rootViewController：您不需要将 notificationController 嵌入到导航控制器中，可以通过以下代码替换 AppDelegate 中的代码：

    func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let notificationController = storyboard.instantiateViewControllerWithIdentifier("DynamicEventsViewController") as! DynamicEventsViewController
    notificationController.isLoadedFromNotification = true
    notificationController.eventTitle = userInfo["aps"]!["alert"] as! String
    notificationController.eventDescription = userInfo["aps"]!["message"] as! String

    if let tabBarController = self.window?.rootViewController {
        tabBarController.presentViewController(notificationController, animated: true, completion: nil)
    }

}

然后您必须在 DynamicEventsViewController（在您的 Storyboard 中）上添加自定义导航栏，并将其 link 添加到您的 class 中，如下所示：

@IBOutlet weak var myNavigationBar: UINavigationBar

最后，您需要将后退按钮事件处理程序替换为以下内容：

func back(sender: UIBarButtonItem) {
        self.dismissViewControllerAnimated(true, completion: nil)
}

Swift: 如何关闭从 AppDelegate 启动的视图控制器和导航控制器

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