How does he know if the other party has uninstalled it?

In his interest, if you want to know whether the other party uninstalled the application, you can generally judge it in the following ways:

1. View in the App Store: Open the App Store to search for the corresponding application name. If the app is displayed as "Installed" in the search results, it means that the other party has not uninstalled the app. If the application is displayed as "Not Installed" or the application cannot be found, it can be inferred that the other party may have uninstalled the application.

2. Ask the other party directly: You can communicate with the other party directly and ask if the other party has uninstalled the application. This is the most direct way, but it may require the cooperation and honest answer of the other party.

3. Observe each other's usage behavior: If they share a social media or communication platform, you can judge whether to uninstall the application by observing each other's dynamics or chat records. If the other party has not been active on the platform for a long time or mentioned the application, it may have been uninstalled.

Extended content: It should be noted that the above methods are based on speculation and indirect observation, and there may be misjudgment. Because the other party may only temporarily delete the application, rather than permanently uninstall it. In addition, some applications may be running in the background or hidden in other ways, and it is impossible to accurately judge whether the other party uninstalled the application. Therefore, if it is important for you whether the other party uninstalls the application, it is recommended to communicate directly with the other party and get a clear answer.