ios - 使用 Parse : show an alert when the app is in background 推送通知

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，应用程序功能正常。但是，如果该应用程序在后台运行，我在点击并打开我的应用程序的通知中心收到通知，我看不到任何包含已发送消息的警报。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

当您从通知中打开应用程序时，通知的有效负载不会自动弹出。

方法:

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

不跟踪应用程序何时从推送通知打开 - 此方法会:

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

正如 M.Othman 在这个帖子中所说:Detect if the app was launched/opened from a push notification

要检查通知:

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");
}

PFPush HandlePush 方法应该显示警报，如果没有，您也可以创建自己的警报 View Controller 。