當應用程序從后台收到推送通知或在iOS中終止時，無法收聽來自NSNotificationCenter的通知

Question

我正在iOS 10中實現推送通知。一切正常。

但是，當APP收到推送通知時（不僅處於活動狀態，而且處於后台/終止狀態），我都需要點擊API。

為此，我使用NSNotificationCenter來監聽應用程序收到如下推送通知時的通知：

   - (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];

}

我像這樣在ViewController.m監聽此通知

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

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

當應用程序在前台運行時，這工作正常。 但不在背景和終止狀態。

我是否有任何錯誤或需要實施的其他任何措施？

Answer 1

從iOS 10開始，我們必須添加UserNotifications框架並委托

所以首先我們需要在appDelegate.h中做以下事情

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

對於FOREGROUND狀態

- (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);
}   

這是背景狀態 。

所以在這里您需要添加通知

- (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中執行didReciveRemoteNotificationNotCalled