当应用程序从后台收到推送通知或在iOS中终止时，无法收听来自NSNotificationCenter的通知

Question

我正在iOS 10中实现推送通知。一切正常。

但是，当APP收到推送通知时（不仅处于活动状态，而且处于后台/终止状态），我都需要点击API。

为此，我使用NSNotificationCenter来监听应用程序收到如下推送通知时的通知：

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

    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 );
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadTheTable" object:nil];

}

我像这样在ViewController.m监听此通知

    - (void)viewDidLoad {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reloadTable:) name:@"reloadTheTable" object:nil];
}

 - (void)reloadTable:(NSNotification *)notification
{
// Calling API here
}

当应用程序在前台运行时，这工作正常。 但不在背景和终止状态。

我是否有任何错误或需要实施的其他任何措施？

Answer 1

从iOS 10开始，我们必须添加UserNotifications框架并委托

所以首先我们需要在appDelegate.h中做以下事情

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

对于FOREGROUND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);
}   

这是背景状态 。

所以在这里您需要添加通知

- (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);

  //Adding notification here
  [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadTheTable" object:nil];
}  

在iOS 10中执行didReciveRemoteNotificationNotCalled