How to exit the application and clear the cache in uniapp

In mobile application development, caching is an inevitable problem. As users use apps more frequently, the cache on the user's device gradually increases, which not only takes up storage space on the user's device, but may also cause the app to run slower. Therefore, in application development, it is necessary to provide a cache clearing mechanism so that users can clear the cache when needed, release device storage space, and improve application performance.

In the uniapp framework, a mechanism to clear the cache is provided. This article will introduce how to implement the function of exiting the application and clearing the cache in the uniapp application.

uniapp cache mechanism

In uniapp, cache is divided into two types: local cache and global cache. The local cache refers to the local cache data used by the uniapp application during operation. It will be deleted after the application exits. The global cache refers to the public resource cache used by the uniapp application, such as image resource cache, animation resource cache, etc., which will not be deleted after the application exits.

In uniapp, you can use uni.setStorageSync, uni.getStorageSync, uni.clearStorageSync and other APIs to operate local cache data; use uni.getImageInfo, uni.getImageData and other APIs to operate global cache data.

Exit the application and clear the cache

To implement the function of clearing the cache when the uniapp application exits, you need to clear the local cache data first when the application exits, and then consider whether to clear the global cache data according to the specific situation.

The following is a sample code that will clear all local cache data when the uniapp application exits:

// App.vue

export default {
  onLaunch() {
    // 应用启动时执行
  },
  onShow() {
    // 应用显示时执行
  },
  onHide() {
    // 应用隐藏时执行
    // 清除本地缓存
    uni.clearStorageSync();
  },
}

In the above code, the uni.clearStorageSync API is used to clear local cache data. This method will clear all local cache data, so it needs to be modified according to the specific situation.

If you need to clear the global cache data, you can call the uni.cache.clearAll method before the application exits. For example, the following code:

// App.vue

export default {
  onLaunch() {
    // 应用启动时执行
  },
  onShow() {
    // 应用显示时执行
  },
  onHide() {
    // 应用隐藏时执行
    // 清除本地缓存
    uni.clearStorageSync();
    // 清除全局缓存
    uni.cache.clearAll();
  },
}

In the above code, the uni.cache.clearAll method is called to clear the global cache data. This method will clear all global cache data, so it needs to be modified according to the specific situation.

It should be noted that clearing the global cache data may have an impact on the performance of the application, so it is recommended to clear only the necessary global cache data when the application exits.

Summary

In the uniapp application, clearing the cache is a very important function. By clearing the cache, you can free up storage space on your device and improve your app's performance and user experience. In this article, we introduce how to clear the cache when the uniapp application exits. We hope it will be helpful to everyone. In actual development, you can choose to clear the local cache, global cache, or both cache data at the same time according to specific circumstances.

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