推送通知没有收到时，应用程序在后台在iOS10

Question

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

我能够在应用程序处于前台状态时收到通知。但当应用程序处于后台状态时，不会收到通知。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

--根本不叫。

我在应用程序功能中启用了推送通知和后台模式下的远程通知。但应用程序仍然没有收到通知。

我提到了一些问题，但没能解决这个问题。iOS版本10中有什么需要添加的吗？或者我的代码中有什么错误吗？

Answer 1

我们已经对客户进行了许多测试，并对该主题进行了大量研究。iOS10. x，尤其是10.3. x有问题处理和显示推送。规避这些问题的唯一方法是升级到一个新的iOS版本。

Answer 2

对于iOS10，我们需要调用下面的2种方法。

对于前景状态

- (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，我们必须添加用户通知框架，并在App授权. h文件中导入

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