ios - 当应用程序处于 iOS 10 后台时无法访问推送通知

Question

对于 iOS 8 和 9，当应用程序在后台时，当收到推送通知时，我可以将信息存储在应用程序中。但是对于 iOS 10，当应用程序处于后台时，我无法检索信息。但只有当我打开/单击通知时，才会调用 userNotification centerDidReceiveNotificationResponse。

对于 iOS 8 和 9，这工作正常。

-(void) application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
    // iOS 10 will handle notifications through other methods

    if( SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO( @"10.0" ) )
    {
        NSLog( @"iOS version >= 10. Let NotificationCenter handle this one." );
        // set a member variable to tell the new delegate that this is background
        return;
    }
    NSLog( @"HANDLE PUSH, didReceiveRemoteNotification: %@", userInfo );

    // custom code to handle notification content

    if( [UIApplication sharedApplication].applicationState == UIApplicationStateInactive )
    {
        NSLog( @"INACTIVE" );
        completionHandler( UIBackgroundFetchResultNewData );
    }
    else if( [UIApplication sharedApplication].applicationState == UIApplicationStateBackground )
    {
        NSLog( @"BACKGROUND" );
        completionHandler( UIBackgroundFetchResultNewData );
    }
    else
    {
        NSLog( @"FOREGROUND" );
        completionHandler( UIBackgroundFetchResultNewData );
    }
}

对于 iOS 10，该方法不会被调用，

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
       willPresentNotification:(UNNotification *)notification
         withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler
{
    NSLog( @"Handle push from foreground" );
    // custom code to handle push while app is in the foreground
    NSLog(@"%@", notification.request.content.userInfo);
}

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
         withCompletionHandler:(void (^)())completionHandler
{
    NSLog( @"Handle push from background or closed" );
    // if you set a member variable in didReceiveRemoteNotification, you  will know if this is from closed or background
    NSLog(@"%@", response.notification.request.content.userInfo);
}

Answer 1

希望您已按照以下步骤操作。

第 1 步:导入“UserNotifications”框架。

#import <UserNotifications/UserNotifications.h> 

第 2 步:您的 AppDelegate 确认“UNUserNotificationCenterDelegate”委托(delegate)

@interface AppDelegate : UIResponder <UIApplicationDelegate,UNUserNotificationCenterDelegate>

第 3 步:对于 iOS10，您可以这样请求权限

UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
center.delegate = self;
[center requestAuthorizationWithOptions:(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error){
     if(!error){
         // Permission for notifications is granted. Do the other code
     }
 }];  

Now I think the problem you are having in your code in Handling delegate methods for UserNotifications.

//Called when a notification is delivered to a foreground app.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler{
    NSLog(@"User Info : %@",notification.request.content.userInfo);
    completionHandler(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge);
}

//Called to let your app know which action was selected by the user for a given notification.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)())completionHandler{
    NSLog(@"User Info : %@",response.notification.request.content.userInfo);
    completionHandler();
}

您的代码缺少一行代码

    completionHandler(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge);

和

    completionHandler();

分别在willPresentNotification和didReceiveNotificationResponse中。