blocks|key|4408634|text|对于那些想要用命令行CURL测试它的人，请遵循下面我使用的语法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4408635|#curl+--location+--request+GET+'https://iid.googleapis.com/iid/info/yourFCMDeviceToken?details=true'+\
--header+'Authorization:+Bearer+YourProject_CloudMessaging_ServerKey'|code-block|syntax|javascript|4408636|响应：|4408637|{
++++applicationVersion:+'4194309',
++++application:+'com.domain.app',
++++scope:+'*',
++++authorizedEntity:+'913674269572',
++++rel:+{+topics:+{+topicName:+{+addDate:+'2020-08-19'+}+}+},
++++appSigner:+'ae7cbSomeHash23jsdfff34ac7ffd',
++++platform:+'ANDROID'
}+|4408638|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For those that would like to test it with command line CURL follow bellow the syntax that I have used:
<pre><code>#curl --location --request GET 'https://iid.googleapis.com/iid/info/yourFCMDeviceToken?details=true' \
--header 'Authorization: Bearer YourProject_CloudMessaging_ServerKey'
</code></pre>
Response:
<pre><code>{
 applicationVersion: '4194309',
 application: 'com.domain.app',
 scope: '*',
 authorizedEntity: '913674269572',
 rel: { topics: { topicName: { addDate: '2020-08-19' } } },
 appSigner: 'ae7cbSomeHash23jsdfff34ac7ffd',
 platform: 'ANDROID'
} 
</code></pre>

blocks|key|4408723|text|这个主题仍然是相关的，在iOS软件开发工具包中仍然没有相关的API。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4408724|如果您的目标是防止用户多次订阅同一主题，从而多次收到通知，例如，一个组中的单个评论，那么我的解决方案是使用UserDefaults的简单本地缓存。|4408725|非常简单：|4408726|++++func+subscribeTo(topic:+String){
++++++++//+first+check+that+the+user+isn't+already
++++++++//+subscribed,+or+they+get+multiple+notifications
++++++++let+localFlag+=+UserDefaults.standard.bool(forKey:+topic)
++++++++if+localFlag+==+true+{
++++++++++++print("user+already+subscribed+to+topic:+\(topic)")
++++++++++++return
++++++++}
++++++++print("attempting+to+subscribe+user+to+topic:+\(topic)")
++++++++//+Subscribe+to+comet+chat+push+notifications+through+Firebase
++++++++Messaging.messaging().subscribe(toTopic:+topic)+{+error+in
++++++++++++if+error+==+nil+{
++++++++++++++++print("subscribed+CometChat+user+to+topic:+\(topic)")
++++++++++++++++//+set+local+flag+as+"already+subbed"
++++++++++++++++UserDefaults.standard.setValue(true,+forKey:+topic)
++++++++++++++++return
++++++++++++}
++++++++++++print("attempt+to+subscribe+CometChat+user+to+topic+\(topic)+failed:+\(error?.localizedDescription+??+"(no+error+provided)")")
++++++++}
++++}|code-block|syntax|javascript|4408727|我的应用程序流让一个用户登录，然后自动获得与该用户关联的主题列表，并在每次启动时自动订阅该主题。|4408728|这样做的原因是在很大程度上保证了用户会收到通知。|4408729|流程:如果topic+==为真，则用户启动app->+topic+retrieved>+iterate+&+pass+topic+to+subscribe+func+->块->+pass+if+topic+!=+true|4408730|当然，在取消订阅时，我们将nil分配给主题键处的本地布尔值。|offset|length|style|CODE|4408731|取消订阅总是成功的，没有这样的阻塞/检查，因为当用户不想要通知时，更好的UX是更保守的。|4408732|干杯。|4408733|entityMap^0|0|0|0|0|0|0|0|D|3|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@$S|1A|T|1B|U|V]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1D|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|11|$]]

This topic is still relevant, still no API for this in the iOS SDK.
If your goal is to prevent a user from subscribing multiple times to the same topic and therefore getting notified multiple times for, say, a single comment in a group, my solution is a simple local cache using UserDefaults.
Pretty straightforward:
<pre class="lang-swift prettyprint-override"><code> func subscribeTo(topic: String){
 // first check that the user isn't already
 // subscribed, or they get multiple notifications
 let localFlag = UserDefaults.standard.bool(forKey: topic)
 if localFlag == true {
 print(&quot;user already subscribed to topic: \(topic)&quot;)
 return
 }
 print(&quot;attempting to subscribe user to topic: \(topic)&quot;)
 // Subscribe to comet chat push notifications through Firebase
 Messaging.messaging().subscribe(toTopic: topic) { error in
 if error == nil {
 print(&quot;subscribed CometChat user to topic: \(topic)&quot;)
 // set local flag as &quot;already subbed&quot;
 UserDefaults.standard.setValue(true, forKey: topic)
 return
 }
 print(&quot;attempt to subscribe CometChat user to topic \(topic) failed: \(error?.localizedDescription ?? &quot;(no error provided)&quot;)&quot;)
 }
 }
</code></pre>
The flow of my application logs a user in, and then automatically gets a list of topics associated with the user and auto-subscribes to the topic with each launch.
The reason for this is a high degree of assurance that the user is getting notified.
The flow:
User launches app-&gt; topics retrieved-&gt; iterate &amp; pass topic to subscribe func -&gt; block if topic == true-&gt; pass through if topic != true
And then of course we assign <code>nil</code> to the local bool at the topic key upon unsubscribe.
Unsubscribes are always successful without such blocking / checking, because it's better UX to be more conservative when a user does NOT want notifications.
Cheers.

blocks|key|4408826|text|从未尝试过编程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4408827|但您可以通过转到firebase控制台->您的项目->云消息->新通知->目标->单击用户段旁边的主题选项卡只需单击消息主题文本框即可获得订阅主题的列表|4408828|​|4408829|📷|atomic|offset|length|4408830|4408831|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/57bce0675898a35d6c380c31df28f688.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@$I|Y|J|Z|1|10]]|A|$]]|$1|K|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]]]

Never tried programmatically.
But you can do it by goto firebase console-&gt;your project-&gt;cloud messaging-&gt;new notification-&gt;target-&gt; click on topic tab next to user segment just click on Message topic text box you will get list of subscribed topics
<a href="https://i.stack.imgur.com/QOhC7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QOhC7.png" alt="enter image description here" /></a>

Using the new FirebaseMessaging it's easy to un/subscribe to topics via:

<pre><code>FirebaseMessaging.getInstance().subscribeToTopic();
FirebaseMessaging.getInstance().unsubscribeFromTopic();
</code></pre>

But is there any way to get all topics the current installation is subscribed to ?

Get all subscribed topics from firebase cloud messaging

软件开发

使用新的FirebaseMessaging，可以通过以下方式轻松取消/订阅主题：FirebaseMessaging.getInstance().subscribeToTopic();FirebaseMessaging.getInstance().unsubscribeFromTopic();但是，有没有办法获得当前安装...

问从firebase云消息中获取所有订阅的主题
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