官方将通知单独放在了UserNotifications.framework，使用时需要导入框架。
UserNotifications.framework主要类文件：

UNCalendarNotificationTrigger
UNLocationNotificationTrigger
UNMutableNotificationContent
UNNotification
UNNotificationAction
UNNotificationAttachment
UNNotificationCategory
UNNotificationContent
UNNotificationRequest
UNNotificationResponse
UNNotificationServiceExtension
UNNotificationSettings
UNNotificationSound
UNNotificationTrigger
UNPushNotificationTrigger
UNTextInputNotificationAction
UNTextInputNotificationResponse
UNTimeIntervalNotificationTrigger
UNUserNotificationCenter

UNUserNotificationCenter的应用：

• 请求用户授权：
  

  UNUserNotificationCenter* center = [UNUserNotificationCenter currentNotificationCenter];    
  // 请求授权    
  /*     
  UNAuthorizationOptionBadge   = (1 << 0),     
  UNAuthorizationOptionSound   = (1 << 1),     
  UNAuthorizationOptionAlert   = (1 << 2),     
  UNAuthorizationOptionCarPlay = (1 << 3),     
  */    
  [center requestAuthorizationWithOptions:(UNAuthorizationOptionAlert + UNAuthorizationOptionSound + UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error) {　　if(granted){

     if(granded)
       //同意
     }else{
       //不同意
     }

  }];

  
  补充：获取授权设置信息
  

  // 获取通知授权和设置    
  [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {        
  /*         
  UNAuthorizationStatusNotDetermined : 没有做出选择         
  UNAuthorizationStatusDenied : 用户未授权         
  UNAuthorizationStatusAuthorized ：用户已授权         
  */        
  if (settings.authorizationStatus == UNAuthorizationStatusNotDetermined) 
  {                       
        NSLog(@"未选择");                  
  }else if (settings.authorizationStatus == UNAuthorizationStatusDenied){                        
        NSLog(@"未授权");                   
  }else if (settings.authorizationStatus == UNAuthorizationStatusAuthorized){                      
        NSLog(@"已授权");        
  }       
  }]

• 创建本地通知：

  // 创建一个本地通知
  UNMutableNotificationContent *content_1 = [[UNMutableNotificationContent alloc] init];    
  // 主标题    
  content_1.title = [NSString localizedUserNotificationStringForKey:@"title" arguments:nil];    
  // 副标题    
  content_1.subtitle = [NSString localizedUserNotificationStringForKey:@"subtitle" arguments:nil];    
  content_1.badge = [NSNumber numberWithInteger:1];    
  content_1.body = [NSString localizedUserNotificationStringForKey:@"title_message_for_yan" arguments:nil];    
  content_1.sound = [UNNotificationSound defaultSound];    
  // 设置触发时间    
  UNTimeIntervalNotificationTrigger *trigger_1 = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:10 repeats:NO];    
  // 创建一个发送请求
  UNNotificationRequest *request_1 = [UNNotificationRequest requestWithIdentifier:@"my_notification" content:content_1 trigger:trigger_1];

  补充：

  • UserNotifications提供了三种触发器：
    

    UNTimeIntervalNotificationTrigger ：一定时间后触发
     
    UNCalendarNotificationTrigger ： 在某月某日某时触发
     
    UNLocationNotificationTrigger ： 在用户进入或是离开某个区域时触发

  • @“my_notification”请求的标识符可以用来管理通知：
    

    - 移除还未展示的通知
    [center removePendingNotificationRequestsWithIdentifiers: @[@“my_notification”]];
    [center removeAllPendingNotificationRequests]; // - (void)cancelAllLocalNotifications；
     
    - 移除已经展示过的通知
    [center removeDeliveredNotificationsWithIdentifiers: