swift - 收到推送通知时加载 ViewController

Question

当用户收到推送通知并点击通知时，他/她将被带入我的应用程序，我希望在其中出现某个 View Controller 。因此我使用通知中心。

我的问题是，我需要在哪里执行 View Controller 的加载，以便在用户进入应用程序时将其显示并推送到导航堆栈上？

func processReceivedRemoteNotification(userInfo:[NSObject:AnyObject]) {

    let notification = userInfo as! Dictionary<String, AnyObject>

    let json = JSON(notification)

    // Get information from payload
    let dispatchType:String = json["dispatch"]["dispatchType"].stringValue

    switch dispatchType {
    case "alert":
        self.notificationCenter.postNotificationName("ALERT_RECEIVED", object: nil, userInfo: userInfo as [NSObject:AnyObject])
        break
    default:
        break
    }
}

要加载的 View Controller

class AlertViewController: UIViewController {

    let notificationCenter: NSNotificationCenter = NSNotificationCenter.defaultCenter()

    override func viewWillAppear(animated: Bool) {
        self.notificationCenter.addObserver(self, selector: "alertMessageReceived:", name: "ALERT_RECEIVED", object: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func alertMessageReceived(notification: NSNotification) {
        let userInfo = notification.userInfo as! Dictionary<String, AnyObject>
        print(userInfo)
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc1: AlertViewController = storyboard.instantiateViewControllerWithIdentifier("example1") as! AlertViewController
        self.navigationController?.pushViewController(vc1, animated: true)
    }

Answer 1

我不知道您的应用架构，但从给定的上下文中我可以看到您有一个 navigationController。在这种情况下，您不应将 AlertViewController 添加为观察者。相反，将此代码移至另一个 View Controller ，该 View Controller 已推送至 navigationController。另一种选择是子类化 UINavigationController 并观察其中的 "ALERT_RECEIVED" 通知。