iOS 8提供了一個令人興奮的新API來創建交互式通知(interactive notifications),它能讓你在你的應用之外爲用戶提供額外的功能。我發現網上還沒有關於如何實現它的比較好的示例教程,所以我將在這篇文章裏來實現一個簡單的交互式通知示例,分享給大家。
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。
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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。
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"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。