iOS8 中的通知：Notification 草稿，正在整理中。。。。

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在ios8中，有了關於本地通知和遠程通知的新改動，下面來看看。

先看一段網上抄來的代碼

  UIMutableUserNotificationAction *notificationAction1 = [[UIMutableUserNotificationAction alloc] init];    notificationAction1.identifier = @"Accept";    notificationAction1.title = @"Accept";    notificationAction1.activationMode = UIUserNotificationActivationModeBackground;    notificationAction1.destructive = NO;    notificationAction1.authenticationRequired = NO;    UIMutableUserNotificationAction *notificationAction2 = [[UIMutableUserNotificationAction alloc] init];    notificationAction2.identifier = @"Reject";    notificationAction2.title = @"Reject";    notificationAction2.activationMode = UIUserNotificationActivationModeBackground;    notificationAction2.destructive = YES;    notificationAction2.authenticationRequired = YES;    UIMutableUserNotificationAction *notificationAction3 = [[UIMutableUserNotificationAction alloc] init];    notificationAction3.identifier = @"Reply";    notificationAction3.title = @"Reply";    notificationAction3.activationMode = UIUserNotificationActivationModeForeground;    notificationAction3.destructive = NO;    notificationAction3.authenticationRequired = YES;    UIMutableUserNotificationCategory *notificationCategory = [[UIMutableUserNotificationCategory alloc] init];    notificationCategory.identifier = @"Email";   // [notificationCategory setActions:@[notificationAction3] forContext:UIUserNotificationActionContextDefault];    [notificationCategory setActions:@[notificationAction1] forContext:UIUserNotificationActionContextMinimal];    NSSet *categories = [NSSet setWithObjects:notificationCategory, nil];    UIUserNotificationType notificationType = UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert;    UIUserNotificationSettings *notificationSettings = [UIUserNotificationSettings settingsForTypes:notificationType categories:categories];    [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];    UILocalNotification* localNotification = [[UILocalNotification alloc] init];    localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:10];    localNotification.alertBody = @"Testing";    localNotification.category = @"Email"; //  Same as category identifier    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

這是一段發送本地通知的代碼，其中涉及到了這次更新的幾個類，

UIMutableUserNotificationAction，UIMutableUserNotificationCategory，UIUserNotificationSettings

我們需要依次產生這幾個對象，最後使用

[[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];把程式的通知設定註冊到系統中去。

注意，當應用程式在前台時，通知到來，系統不會為程式彈出alert，而是會調用相應的

didReceiveLocalNotification 和 

didReceiveRemoteNotification 這2個代理函數，把通知內容交給程式自身處理。而當程式不在前台時，系統才會為使用者彈出alert，提示使用者進行相應操作。 這裡

UIMutableUserNotificationAction就代表了一個操作，在介面上的表示形式就是一個按鈕，當點擊按鈕時，就會調用

- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forLocalNotification:(UILocalNotification *)notification completionHandler:(void (^)())completionHandler 或者 

- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler NS_AVAILABLE_IOS(8_0);

不會再調用

didReceiveLocalNotification 和 

didReceiveRemoteNotification 這2個代理函數了。

在

UIMutableUserNotificationAction 中有一個屬性，

activationMode，當它是

UIUserNotificationActivationModeBackground時，系統會選在在後台執行代碼，執行的時間是有限的，我測試的是30s，如果超過30s你的程式還在後台執行，那麼系統會終止調你的程式，並拋出異常。異常如下

<Warning>: <BKNewProcess: 0x17e685f0; -.bbbb; pid: 922; hostpid: -1> has active assertions beyond permitted time:     {(        <BKProcessAssertion: 0x17d6b4f0> id: 42-2B9D290F-7F21-4DCB-955B-9D80DE693382 name: Notification action process: <BKNewProcess: 0x17e685f0; -.bbbb; pid: 922; hostpid: -1> permittedBackgroundDuration: 30.000000 reason: notificationAction owner pid:42 preventSuspend  preventThrottleDownUI  preventIdleSleep  preventSuspendOnSleep ,        <BKProcessAssertion: 0x17d6de50> id: 42-707C3B54-51BC-47DA-B779-B11888416FE4 name: Deliver Message process: <BKNewProcess: 0x17e685f0; -.bbbb; pid: 922; hostpid: -1> permittedBackgroundDuration: 10.000000 reason: suspend owner pid:42 preventSuspend  preventThrottleDownCPU  preventThrottleDownUI  preventSuspendOnSleep     )}

注意，如果你沒有點擊action按鈕，而是通過點擊通知內容本身，那麼系統扔會像ios7一樣，調用

didReceiveLocalNotification 和 

didReceiveRemoteNotification 這2個代理函數。

 

如果程式沒有啟動，使用者點擊action按鈕後，系統會先調用

didFinishLaunchingWithOptions啟動程式，再調用

- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forLocalNotification:(UILocalNotification *)notification completionHandler:(void (^)())completionHandler 或者 

- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler NS_AVAILABLE_IOS(8_0);

來處理action，這一點和以前點擊通知內容本身的效果一致，都會先啟動程式，再調用相應函數。

 

iOS8 中的通知：Notification 草稿，正在整理中。。。。