iOS 应用程序:如何清除通知? [英] iOS application: how to clear notifications?

问题描述

我有一个 iOS 应用程序，一些推送通知会发送到其中.我的问题是，消息/通知在点击后仍保留在 iOS 的通知中心中.下次打开应用程序时，如何在通知中心删除我的应用程序的通知?

I've an iOS application where some Push Notification are sent to. My problem is, that the messages/notifications stays in the Notification Center in iOS after then are tapped. How can I remove a notification for my application in the Notification Center next time the application opens?

我看到有人将 setApplicationIconBadgeNumber 调用为零值以清除通知的帖子.这对我来说似乎很奇怪，所以我相信可能存在另一种解决方案?

I came across posts where people are calling setApplicationIconBadgeNumber to a zero-value to clear the notifications. That's seems very weird to me, so I believe that maybe another solution exists?

我在清除通知时遇到了一些问题.请在此处查看我的代码:

I'm having some problems clearing the notifications. Please see my code here:

- (void) clearNotifications {
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0];
    [[UIApplication sharedApplication] cancelAllLocalNotifications];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if (launchOptions != nil)
    {
        NSDictionary* dictionary = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey];
        if (dictionary != nil)
        {
            NSLog(@"Launched from push notification: %@", dictionary);

            [self clearNotifications];
        }
    }

    return YES;
}

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo
{    
    NSLog(@"Received notification: %@", userInfo);
    [self clearNotifications];
}

我正在通过 Xcode 运行该应用程序.当应用程序最小化并使用通知中心的通知启动应用程序时，我可以在日志中看到 didReceiveRemoteNotification 被调用并使用了我可以看到的断点，clearNotifications 已经跑了.但通知仍然挂在通知中心.为什么?

I'm running the App through Xcode. When the App is minimized and I start the App using the notification in the Notification Center, I can see in the log, that the didReceiveRemoteNotification is called and using breakpoints I can see, that the clearNotifications has ran. But still the notification hangs in the Notification Center. Why?

推荐答案

很可能是因为通知中心是一个相对较新的功能，Apple 不一定想要推出全新的清除通知范式.所以相反，他们多用途 [[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0]; 来清除所述通知.这可能看起来有点奇怪，Apple 可能会在未来提供更直观的方式来执行此操作，但目前这是官方方式.

Most likely because Notification Center is a relatively new feature, Apple didn't necessarily want to push a whole new paradigm for clearing notifications. So instead, they multi-purposed [[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0]; to clear said notifications. It might seem a bit weird, and Apple might provide a more intuitive way to do this in the future, but for the time being it's the official way.

我自己，我使用这个片段:

Myself, I use this snippet:

[[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0];
[[UIApplication sharedApplication] cancelAllLocalNotifications];

从通知中心清除所有应用的通知.

which never fails to clear all of the app's notifications from Notification Center.

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