iOS 8中创建交互式通知
jopen
10年前
iOS 8提供了一个令人兴奋的新API来创建交互式通知（interactive notifications），它能让你在你的应用之外为用户提供额外的功能。我发现网上还没有关于如何实现它的比较好的示例教程，所以我将在这篇文章里来实现一个简单的交互式通知示例，分享给大家。
为了创建交互式通知，需要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。
这里是一个非常简单的使用Objective-C编写的示例，演示如何注册一个包含两个动作的通知。
NSString * const NotificationCategoryIdent = @"ACTIONABLE";NSString * const NotificationActionOneIdent = @"ACTION_ONE";NSString * const NotificationActionTwoIdent = @"ACTION_TWO"; - (void)registerForNotification { UIMutableUserNotificationAction *action1; action1 = [[UIMutableUserNotificationAction alloc] init]; [action1 setActivationMode:UIUserNotificationActivationModeBackground]; [action1 setTitle:@"Action 1"]; [action1 setIdentifier:NotificationActionOneIdent]; [action1 setDestructive:NO]; [action1 setAuthenticationRequired:NO]; UIMutableUserNotificationAction *action2; action2 = [[UIMutableUserNotificationAction alloc] init]; [action2 setActivationMode:UIUserNotificationActivationModeBackground]; [action2 setTitle:@"Action 2"]; [action2 setIdentifier:NotificationActionTwoIdent]; [action2 setDestructive:NO]; [action2 setAuthenticationRequired:NO]; UIMutableUserNotificationCategory *actionCategory; actionCategory = [[UIMutableUserNotificationCategory alloc] init]; [actionCategory setIdentifier:NotificationCategoryIdent]; [actionCategory setActions:@[action1, action2] forContext:UIUserNotificationActionContextDefault]; NSSet *categories = [NSSet setWithObject:actionCategory]; UIUserNotificationType types = (UIUserNotificationTypeAlert| UIUserNotificationTypeSound| UIUserNotificationTypeBadge); UIUserNotificationSettings *settings; settings = [UIUserNotificationSettings settingsForTypes:types categories:categories]; [[UIApplication sharedApplication] 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" : "Pull down to interact.", "category" : "ACTIONABLE"}
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 *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void (^)())completionHandler { if ([identifier isEqualToString:NotificationActionOneIdent]) { NSLog(@"You chose action 1."); } else if ([identifier isEqualToString:NotificationActionTwoIdent]) { NSLog(@"You chose action 2."); } if (completionHandler) { completionHandler(); }}