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。
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:
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。
- (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。