iOS推送通知-单击应用程序图标而不是通知时如何获取通知数据

Question

Similar to this question: How do I access remote push notification data on applicationDidBecomeActive?

But the different is how can you access the notification data when you are in applicationDidBecomeActive and if you have clicked on the app icon instead of the push notification.

The flow is: If you click on the push notification then didReceiveRemoteNotification will be triggered, but if you click on the original app icon, only applicationDidBecomeActive will be triggered and didReceiveRemoteNotification will not be called.

I am looking for the later case so how can I access the push notification data.

(Both case assuming the app is in background and not killed yet.)

Answer 1

You can't get remote push payload by launching app from homescreen.

If the push data is important for app use, load it from your server after app launched.

Answer 2

@fannheyward answer is absolutely correct. You cannot get payload when application is launched by tapping app icon.

I have an idea, what if you get to know that some notification is pending when app is launched by tapping app icon. With this knowledge your app can fetch payload from your server.

You can set "Badge" in every such notification and on applicationDidBecomeActive you can check [application applicationIconBadgeNumber] > 0 to know that some notification is active. After fetching payload from your server you can set it to 0 like below

[UIApplication sharedApplication] setApplicationIconBadgeNumber:1];
[[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];

Please note: This means your app will have badge displayed over it when notification is received. I am not sure of the behaviour when badge is disabled by user from settings.

Answer 3

If your application target is over iOS7, you can do only if application is alive in backgroud.

In the capabilities settings at Xcode, you should enable Background Modes>Remote notifications, and write below code.

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{ 
    // save userInfo in NSUserDefaults
    completionHandler( UIBackgroundFetchResultNoData );
}

If you want to test it, it will be helpful to use https://github.com/acoomans/SimulatorRemoteNotifications

• From the server side, make sure to set content-available property with a value of 1

For this to work I also had to check the background fetch box.

Answer 4

You should get the notification in the launchWithOptions method in your appDelegate something like this:

NSDictionary *remoteNotif = [launchOptions objectForKey: UIApplicationLaunchOptionsRemoteNotificationKey];   

    if(remoteNotif != nil){  
        //Handle your notification   
    }