iOS推送通知：当应用程序处于后台时，如何检测用户是否点击了通知？ [英] iOS push notification: how to detect if the user tapped on notification when the app is in background?

问题描述

关于这个主题有很多stackoverflow线程，但我仍然没有找到一个好的解决方案。

如果应用程序不在后台，我可以在应用程序中检查 launchOptions [UIApplicationLaunchOptionsRemoteNotificationKey] ：didFinishLaunchingWithOptions：调用以查看它是否从通知中打开。

如果应用程序在后台，所有帖子建议使用应用程序：didReceiveRemoteNotification：并检查应用程序状态。但是当我进行实验时（以及此API的名称建议），此方法在收到通知时被调用，而不是被调用。

所以问题是，如果应用程序已启动然后后台运行，并且您知道从应用程序收到通知：didReceiveNotification （ application：didFinishLaunchWithOptions：此时不会触发），如何通过点击通知或只是点击应用图标来了解用户是否恢复了应用？因为如果用户点击了通知，则期望打开该通知中提到的页面。否则它不应该。

我可以使用 handleActionWithIdentifier 来获取自定义操作通知，但这只会在点击自定义操作按钮，而不是当用户点击通知主体时。

谢谢。

编辑：

在阅读下面的一个答案后，我想这样我可以澄清我的问题：

我们如何区分这两种情况：

（A）1.app转到后台; 2.收到通知; 3.用户点击通知; 4. app进入前台

（B）1.app转到后台; 2.收到通知; 3.用户稍后忽略通知并点击应用程序图标; 4. app进入前台

由于应用程序：didReceiveRemoteNotification：在步骤2中都会触发。

或者，应该应用程序：didReceiveRemoteNotification：仅在步骤3中针对（A）触发，但我以某种方式将我的应用程序配置错误所以我在第2步看到了它？

解决方案

好的我终于想通了。

在目标设置➝功能选项卡➝后台模式中，如果选中远程通知，应用程序：didReceiveRemoteNotification：将在通知到达后立即触发（只要应用程序在后台），在这种情况下，无法判断用户是否会点击通知。

如果取消选中框，应用程序：didReceiveRemoteNotification：只有在您点击通知时才会触发。

有点奇怪选中此框将改变h其中一个app委托方法的行为。如果选中此框会更好，Apple会使用两种不同的委托方法进行通知接收和通知点击。我认为大多数开发人员总是想知道是否有通知。

希望这对遇到此问题的其他人有帮助。 Apple也没有明确记录

There are a lot of stackoverflow threads regarding this topic, but I still didn't find a good solution.

If the app is not in the background, I can check launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey] in application:didFinishLaunchingWithOptions: call to see if it's opened from a notification.

If the app is in the background, all the posts suggest to use application:didReceiveRemoteNotification: and check the application state. But as I experimented (and also as the name of this API suggests), this method gets called when the notification is received, instead of tapped.

So the problem is, if the app is launched and then backgrounded, and you know a notification is received from application:didReceiveNotification (application:didFinishLaunchWithOptions: won't trigger at this point), how do you know if user resumed the app from by tapping the notification or just tapping the app icon? Because if the user tapped the notification, the expectation is to open the page mentioned in that notification. Otherwise it shouldn't.

I could use handleActionWithIdentifier for custom action notifications, but this only gets triggered when a custom action button is tapped, not when the user taps on the main body of the notification.

Thanks.

EDIT:

after reading one answer below, I thought in this way I can clarify my question:

How can we differentiate these 2 scenarios:

(A) 1.app goes to background; 2.notification received; 3. user taps on the notification; 4. app enters foreground

(B) 1.app goes to background; 2.notification received; 3. user ignores the notification and taps on the app icon later; 4. app enters foreground

Since application:didReceiveRemoteNotification: is triggered in both cases at step 2.

Or, should application:didReceiveRemoteNotification: be triggered in step 3 for (A) only, but I somehow configured my app wrong so I'm seeing it at step 2?

解决方案

OK I finally figured out.

In the target settings ➝ Capabilities tab ➝ Background Modes, if you check "Remote Notifications", application:didReceiveRemoteNotification: will get triggered as soon as notification arrives (as long as the app is in the background), and in that case there is no way to tell whether the user will tap on the notification.

If you uncheck that box, application:didReceiveRemoteNotification: will be triggered only when you tap on the notification.

It's a little strange that checking this box will change how one of the app delegate methods behaves. It would be nicer if that box is checked, Apple uses two different delegate methods for notification receive and notification tap. I think most of the developers always want to know if a notification is tapped on or not.

Hopefully this will be helpful for anyone else who run into this issue. Apple also didn't document it clearly here so it took me a while to figure out.

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