爲了創建交互式通知，需要iOS 8提供的3個新類：UIUserNotificationSettings, UIUserNotificationCategory, UIUserNotificationAction 以及它們的變體。
和以前簡單地註冊通知類型（sounds、banners、alerts）相比，現在你可以註冊自定義的通知類別（categories）和動作（actions）。類別描述了應用自定義的通知類型，並且包含用戶能夠執行的響應動作。比如，你收到一個通知說某人在社交網上了關注了你，作爲迴應你可能會想要關注他或者忽略。
這裏是一個非常簡單的使用Objective-C編寫的示例，演示如何註冊一個包含兩個動作的通知。
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];
}
要發送這個通知類型，只需簡單的將category添加到聲明裏。
“aps” : {
“alert” : “Pull down to interact.”,
“category” : “ACTIONABLE”
}
現在爲了響應用戶選擇的操作，你需要在UIApplicationDelegate協議添加兩個新方法：
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application:handleActionWithIdentifier:forLocalNotification:completionHandler:
application:handleActionWithIdentifier:forRemoteNotification:completionHandler:
用戶從你的推送通知中選擇一個動作後，該方法將會在後臺被調用。
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(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();}
}
如文檔所述，通過標示符來判定是哪個動作被選中，最後調用completionHandler，即可大功告成。這裏僅僅簡單的演示了一下iOS 8 新通知API表面上的功能，今後我將更深入的研究一下，有機會再和大家分享。
文章鏈接:http://www.cocoachina.com/ios/20141009/9857.html
