当 App 在 iOS 10 中处于后台时未收到推送通知

Question

我正在使用 FCM(Firebase Cloud Messaging) 在 iOS 中发送推送通知。

我可以在应用程序处于前台状态时收到通知。但是当App处于后台状态时，收不到通知。每当应用程序进入前台状态时，才会收到通知。

我的代码是：

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
   willPresentNotification:(UNNotification *)notification
     withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
// Print message ID.
NSDictionary *userInfo = notification.request.content.userInfo;
NSLog(@"Message ID: %@", userInfo[@"gcm.message_id"]);

// Pring full message.
NSLog(@"%@", userInfo);

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



- (void)applicationDidEnterBackground:(UIApplication *)application {


}

当App处于后台状态时：

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
   willPresentNotification:(UNNotification *)notification
     withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler

-- 根本没有被调用。

我在 App Capabilities 的后台模式下启用了推送通知和远程通知。但是App还是收不到通知

我参考了一些 Whosebug 问题，但无法解决问题。 iOS 版本 10 中是否有任何要添加的内容或我的代码中有任何错误？

Answer 1

对于iOS10，我们需要调用以下2个方法。

前景状态

- (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);
    completionHandler(UNNotificationPresentationOptionAlert);
}

背景状态

- (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);
    completionHandler();
}

在此之前，我们必须添加UserNotifications框架并在AppDelegate.h文件中导入

#import <UserNotifications/UserNotifications.h>  
@interface AppDelegate : UIResponder <UIApplicationDelegate,UNUserNotificationCenterDelegate>

Answer 2

我们已经运行与我们的客户进行了多次测试，并就该主题进行了大量研究。 iOS 10.x，尤其是 10.3.x 在处理和显示推送方面存在问题。避免这些问题的唯一方法是升级到较新的 iOS 版本。

当 App 在 iOS 10 中处于后台时未收到推送通知

Push notification not received when App is in Background in iOS 10

objective-c

ios

firebase

firebase-cloud-messaging

firebase-notifications