What should I do if uniapp cannot exit completely?

With the popularity of mobile applications, cross-platform development tools are becoming more and more popular among developers. Among them, Uniapp, as a cross-platform framework similar to React Native, can quickly create multi-terminal applications such as iOS, Android, and H5, and is very popular among developers. However, when using Uniapp to develop applications, we may encounter some strange problems, such as the problem that the application cannot completely exit.

If you have ever used Uniapp to develop applications, you may have also encountered this problem: when you press the return key, the application will close to the desktop, but the application process is still running in the background. If you open the application again, You will find that it is already running in the same state as when you last left it. In this article, we will explore the causes of this problem and how to solve it.

Cause of the problem

Applications under the Uniapp architecture are actually based on webview, so many application life cycle events will behave differently from native mobile applications. For example, when the user presses the return key, the application's "destruction" event should be triggered to destroy all the application's resources. However, in Uniapp, if the developer does not implement the destruction event correctly, the application may be closed to the background, but in reality is still running.

Specifically, in the Uniapp application life cycle, the "pause" event will be triggered when the application is switched to the background, and the "destroy" event will be triggered when the application is destroyed. If developers do not implement the destruction event correctly, the application will be "half-killed": although the process has been destroyed, some processes are still running. Therefore, when you open the app again, you will find that the app is still running.

Solution

In order to solve this problem, developers need to correctly implement the application life cycle events. Specifically, developers should manually destroy all application resources in the application's "destroy" event, including closing all timers, clearing all caches, disconnecting all network connections, etc. Only by correctly implementing the destruction event can you ensure that all resources are released when the application is closed, so that the application can be restarted the next time it is opened again.

In addition, there are some other solutions. For example, developers can solve this problem by setting the application's startup mode. In Uniapp's manifest.json file, you can set the app's startup mode to "singleTop" mode, which will ensure that the app will not run any previously saved state after restarting. However, this solution may prevent the app from retaining state in some cases, so it needs to be used with caution.

Summary

Uniapp is a powerful cross-platform development framework that can help developers quickly develop multi-terminal applications such as iOS, Android, and H5. However, due to its unique architecture, developers may encounter some unexpected problems, such as the inability of the app to exit completely. Only by correctly implementing the application's destruction event can we ensure that all resources are released when the application is closed so that the application can be restarted the next time it is opened again.

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