通过Parse推送通知：当应用程序在后台时显示提醒

Question

在我的应用程序中，我从Parse.com发送推送通知。我创建并安装了所有证书和应用程序功能。但是，如果应用程序处于后台，我会在通知中心收到一条通知，告知我正在点按并打开我的应用程序，但看不到包含发送消息的任何警报。代码如下：

import UIKit 
import Parse 

@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { 

    var window: UIWindow? 


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 

     Parse.setApplicationId("appid", 
      clientKey: "clientkey") 

     // Register for Push Notitications 
     if application.applicationState != UIApplicationState.Background { 
      // Track an app open here if we launch with a push, unless 
      // "content_available" was used to trigger a background push (introduced in iOS 7). 
      // In that case, we skip tracking here to avoid double counting the app-open. 

      let preBackgroundPush = !application.respondsToSelector("backgroundRefreshStatus") 
      let oldPushHandlerOnly = !self.respondsToSelector("application:didReceiveRemoteNotification:fetchCompletionHandler:") 
      var pushPayload = false 
      if let options = launchOptions { 
       pushPayload = options[UIApplicationLaunchOptionsRemoteNotificationKey] != nil 
      } 
      if (preBackgroundPush || oldPushHandlerOnly || pushPayload) { 
       PFAnalytics.trackAppOpenedWithLaunchOptions(launchOptions) 
      } 
     } 

     if application.respondsToSelector("registerUserNotificationSettings:") { 
      let userNotificationTypes: UIUserNotificationType = [UIUserNotificationType.Alert, UIUserNotificationType.Badge, UIUserNotificationType.Sound] 
      let settings = UIUserNotificationSettings(forTypes: userNotificationTypes, categories: nil) 
      application.registerUserNotificationSettings(settings) 
      application.registerForRemoteNotifications() 
     } else { 
      let types: UIRemoteNotificationType = [UIRemoteNotificationType.Badge, UIRemoteNotificationType.Alert, UIRemoteNotificationType.Sound] 
      application.registerForRemoteNotificationTypes(types) 
     } 

     if let notification = launchOptions as? [String : AnyObject] { 
      if let notificationDictionary = notification[UIApplicationLaunchOptionsRemoteNotificationKey] as? [NSObject : AnyObject] { 
       self.application(application, didReceiveRemoteNotification: notificationDictionary) 
      } 
     } 

     return true 
    } 

    func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) { 
     let installation = PFInstallation.currentInstallation() 
     installation.setDeviceTokenFromData(deviceToken) 
     installation.saveInBackground() 
    } 

    func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) { 
     if error.code == 3010 { 
      print("Push notifications are not supported in the iOS Simulator.") 
     } else { 
      print("application:didFailToRegisterForRemoteNotificationsWithError: %@", error) 
     } 
    } 

    func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) { 

     if application.applicationState == UIApplicationState.Inactive { 
      PFAnalytics.trackAppOpenedWithRemoteNotificationPayload(userInfo) 
     } 

     PFPush.handlePush(userInfo) 
    } 

    func clearBadges() { 

     let installation = PFInstallation.currentInstallation() 
     installation.badge = 0 
     installation.saveInBackgroundWithBlock { (success, error) -> Void in 
      if success { 
       print("cleared badges") 
       UIApplication.sharedApplication().applicationIconBadgeNumber = 0 
      } 
      else { 
       print("failed to clear badges") 
      } 
     } 
    } 


    func applicationDidBecomeActive(application: UIApplication) { 

     clearBadges() 
    } 


    func applicationWillResignActive(application: UIApplication) { 
     // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. 
     // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game. 
    } 

    func applicationDidEnterBackground(application: UIApplication) { 
     // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
     // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 
    } 

    func applicationWillEnterForeground(application: UIApplication) { 
     // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background. 
    } 


    func applicationWillTerminate(application: UIApplication) { 
     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 
    } 
} 

Answer 1

当您从该通知中打开您的应用程序时，通知的有效负载不会自动弹出。

的方法：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo 

当应用程序从一个推送通知开启不跟踪 - 这种方法做：

(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 

随着下降M.Othman在这个线程：Detect if the app was launched/opened from a push notification

检查通知：

UILocalNotification *notification = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey]; 
if (notification) { 
    NSLog(@"app recieved notification from remote%@",notification); 
    [self application:application didReceiveRemoteNotification:(NSDictionary*)notification]; 
}else{ 
    NSLog(@"app did not recieve notification"); 
} 

如果PFPush HandlePush方法不能创建自己的警报视图控制器，则它应该显示警报。