iOS 7 中的静默推送通知不起作用 [英] Silent Push Notification in iOS 7 does not work

问题描述

在 WWDC 2013 的多任务新功能"演示中，有一节是关于静默推送通知的.看起来很直接.根据介绍，如果您发送 APS 负载时仅将 content-available 设置为 1，则用户将不会收到通知.

In the WWDC 2013's "What's New with Multitasking" presentation, there is a section about Silent Push Notifications. It seems straight forward. According to the presentation, if you send the APS payload with just the content-available set to 1, users will not be notified of the notification.

// A. This doesn't work
{ 
  aps: { 
          content-available: 1 
       }
}

我的测试表明这不起作用，因为没有收到推送.但是如果我包含 sound 属性但排除 alert 属性，它就可以工作(虽然不再沉默).

My testing shows that this does not work as no push is received. But if I include the sound attribute but exclude the alert attribute, it works (though not silent anymore).

// B. This works
{ 
  aps: {
          content-available: 1,
          sound: "default"
       }
}

但是，如果我将声音属性更改为播放无声音频，则可以模拟无声推送.

However, if I change the sound attribute to play a silent audio, I can mimic a silent push.

// C. This works too.
{ 
  aps: {
          content-available: 1,
          sound: "silence.wav"
       }
}

有谁知道:

1. 如果这是一个错误?
2. 如果假设 B 或 C 被视为远程通知是正确的(而不是需要声音属性的静默推送的错误)?如果是这样，这意味着它不会像 Silent Pushes 那样受到速率限制……Apple 可能会解决这个问题.所以我可能不应该依赖它.
3. 速率限制是多少(N 次每 X 秒推送一次，等等)?

提前致谢.

使用更多信息进行编辑

对于 A，应用程序的状态无关紧要.永远不会收到通知.

For A, the state of the application does not matter. Notification is never received.

似乎 B 和 C 仅在将属性和值括在引号中时才有效，如下所示.

It seems like B and C only work if you enclose the attributes and values in quotes, like below.

{"aps":{"content-available": 1, "sound":"silent.wav"}}

无论状态如何，通知都会到达application:didReceiveRemoteNotification:fetchCompletionHandler:.

And the notification arrives in application:didReceiveRemoteNotification:fetchCompletionHandler: regardless of state.

推荐答案

这也有效，到达时不播放声音:

This works also and does not play a sound when it arrives:

{
    aps = {
        "content-available" : 1,
        sound : ""
    };
}

编辑

遇到此问题的人可能想查看此链接.我一直在参与 Apple 开发者论坛上的一个帖子，该帖子讨论了所有应用程序状态以及何时接收和未接收到静默推送.

People having this problem may want to check out this link. I have been participating in a thread on Apple's Developer forum that goes over all app states and when silent pushes are received and not received.

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