iOS10通知框架UserNotification理解与应用

七、定义通知模板UNNotificationCategory

        聊天类软件在iOS系统中，常常采用后台推送的方式推送新消息，用户可以在不进入应用程序的情况下，直接在左面回复通知推送过来的信息，这种功能就是通过UNNotificationCategory模板与UNNotificationAction用户活动来实现的。关于文本回复框，UserNotification框架中提供了UNTextInputNotificationAction类，其是UNNotificationAction的子类。示例代码如下：

 //创建用户活动
 /*
 options参数可选如下：
 //需要在解开锁屏下使用
 UNNotificationActionOptionAuthenticationRequired
 //是否指示有破坏性
 UNNotificationActionOptionDestructive
 //是否允许活动在后台启动app
 UNNotificationActionOptionForeground
 //无设置
 UNNotificationActionOptionNone
 */
 UNTextInputNotificationAction * action = [UNTextInputNotificationAction actionWithIdentifier:@"action" title:@"回复" options:UNNotificationActionOptionAuthenticationRequired textInputButtonTitle:@"活动" textInputPlaceholder:@"请输入回复内容"];
 //创建通知模板
 UNNotificationCategory * category = [UNNotificationCategory categoryWithIdentifier:@"myNotificationCategoryText" actions:@[action] intentIdentifiers:@[] options:UNNotificationCategoryOptionCustomDismissAction];
 UNMutableNotificationContent * content = [UNMutableNotificationContent new];
 content.badge = @1;
 content.body = @"这是iOS10的新通知内容：普通的iOS通知";
 //默认的通知提示音
 content.sound = [UNNotificationSound defaultSound];
 content.subtitle = @"这里是副标题";
 content.title = @"这里是通知的标题";
 //设置通知内容对应的模板 需要注意 这里的值要与对应模板id一致
 content.categoryIdentifier = @"myNotificationCategoryText";
 //设置5S之后执行
 UNTimeIntervalNotificationTrigger * trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:5 repeats:NO];
  [[UNUserNotificationCenter currentNotificationCenter] setNotificationCategories:[NSSet setWithObjects:category, nil]];
 UNNotificationRequest * request = [UNNotificationRequest requestWithIdentifier:@"NotificationDefaultText" content:content trigger:trigger];
 
 [[UNUserNotificationCenter currentNotificationCenter] addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
  
 }];