iOS 8提供的3个新类：UIUserNotificationSettings,UIUserNotificationCategory,UIUserNotificationAction以及它们的变体。
和 以前简单地注册通知类型（sounds、banners、alerts）相比，现在你可以注册自定义的通知类别（categories）和动作 （actions）。类别描述了应用自定义的通知类型，并且包含用户能够执行的响应动作。比如，你收到一个通知说某人在社交网上了关注了你，作为回应你可 能会想要关注他或者忽略。
#define NotificationCategoryIdent @"ACTIONABLE"
#define NotificationActionOneIdent @"ACTION_ONE"
#define NotificationActionTwoIdent @"ACTION_TWO"
注册通知
UIMutableUserNotificationAction*action1;
action1=[[UIMutableUserNotificationActionalloc]init];
[action1setActivationMode:UIUserNotificationActivationModeBackground];
[action1setTitle:@"Action1"];
[action1setIdentifier:NotificationActionOneIdent];
[action1setDestructive:NO];
[action1setAuthenticationRequired:NO];
UIMutableUserNotificationAction*action2;
action2=[[UIMutableUserNotificationActionalloc]init];
[action2setActivationMode:UIUserNotificationActivationModeBackground];
[action2setTitle:@"Action2"];
[action2setIdentifier:NotificationActionTwoIdent];
[action2setDestructive:NO];
[action2setAuthenticationRequired:NO];
UIMutableUserNotificationCategory*actionCategory;
actionCategory=[[UIMutableUserNotificationCategoryalloc]init];
[actionCategorysetIdentifier:NotificationCategoryIdent];
[actionCategorysetActions:@[action1,action2]
forContext:UIUserNotificationActionContextDefault];
NSSet*categories=[NSSetsetWithObject:actionCategory];
UIUserNotificationTypetypes=(UIUserNotificationTypeAlert|
UIUserNotificationTypeSound|
UIUserNotificationTypeBadge);
UIUserNotificationSettings*settings;
settings=[UIUserNotificationSettingssettingsForTypes:types
categories:categories];
[[UIApplicationsharedApplication]registerUserNotificationSettings:settings];
}
要发送这个通知类型，只需简单的将category添加到声明里。
{"aps":{"alert":"测试","category":"ACTIONABLE","badge":1,"sound":"default","custom":{"t":"jump","p":"second"}}}
现在为了响应用户选择的操作，你需要在UIApplicationDelegate协议添加两个新方法：
application:handleActionWithIdentifier:forLocalNotification:completionHandler:
application:handleActionWithIdentifier:forRemoteNotification:completionHandler:
用户从你的推送通知中选择一个动作后，该方法将会在后台被调用。
-(void)application:(UIApplication*)applicationhandleActionWithIdentifier:(NSString*)identifierforRemoteNotification:(NSDictionary*)userInfocompletionHandler:(void(^)())completionHandler{
if([identifierisEqualToString:NotificationActionOneIdent]){
NSLog(@"Youchoseaction1.");
}
elseif([identifierisEqualToString:NotificationActionTwoIdent]){
NSLog(@"Youchoseaction2.");
}
if(completionHandler){
completionHandler();
}
}