推送通知收到时使用协议更新UIViewController？

Question

这是在AppDelegate中收到推送通知后通知UIViewController的正确方法吗？ UIViewController需要在获得推送通知后刷新其内容。 Swift新手如此想确认这是Swift中的一种有效方法。

的AppDelegate：

protocol PushNotificationDelegate : class { 
    func didReceivePushNotification() 
} 


@UIApplicationMain 
class AppDelegate: UIResponder, UIApplicationDelegate { 
    var window: UIWindow? 
    var pushDelegates = [PushNotificationDelegate]() 

    ... 

    func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) { 
     PFPush.handlePush(userInfo) 
     if application.applicationState == UIApplicationState.Inactive { 
      PFAnalytics.trackAppOpenedWithRemoteNotificationPayload(userInfo) 
     } 

     // Notify delegates 
     for delegate in pushDelegates { 
      delegate.didReceivePushNotification() 
     } 
    } 


    func addPushNotificationDelegate(newDelegate: PushNotificationDelegate) { 
     if (pushDelegates.indexOf{$0 === newDelegate} == nil) { 
      pushDelegates.append(newDelegate) 
     } 
    } 
} 

的UIViewController：

class HomeViewController: UIViewController, PushNotificationDelegate { 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     ... 

     // Get notified when push notifications come in 
     if let delegate = UIApplication.sharedApplication().delegate as? AppDelegate { 
      delegate.addPushNotificationDelegate(self) 
     } 
    } 


    func didReceivePushNotification() { 

    } 
    } 

Answer 1

好吧，这一切看起来很好，地道的斯威夫特。有一点需要记住的是，您需要确保从AppDelegate中维护的委托列表中删除视图控制器，当它被解散时。否则，你的视图控制器将不会从内存中移除。您可以在HomeViewController中实现该代码：

-(void)viewWillDisappear(animated:Bool){ 
    [super viewWillDisappear] 
//Remove 'self' from the delegate array maintained in AppDelegate. 
}