How to implement clear cache function in uniapp

In the development of mobile applications, caching is a common technical means that can speed up the response speed of the application and improve the user experience. However, as application data continues to increase, the cache will become larger and larger, causing the application to run slowly or even crash. Therefore, clearing cache functionality has become an integral part of mobile app development.

In the Uniapp framework, an API interface for clearing the cache is provided, which can help us easily implement the cache clearing function. Next, let’s take a look at how to use the clear cache function in Uniapp.

1. Get the cache size

Before clearing the cache, we need to get the cache size of the current application. Uniapp provides the uni.getStorageInfoSync() interface to obtain cache information. This interface will return an object that contains all cache information of the current application, such as cache size, remaining available space, etc.

The code is as follows:

let storageInfo = uni.getStorageInfoSync();
let size = storageInfo.currentSize;

This code will get the cache size of the current application and store it in a variable. It should be noted that the cache size obtained here is in bytes and needs to be converted into a more readable unit (such as KB, MB, GB, etc.).

2. Clear the cache

After obtaining the cache size of the application, the next step is to clear the cache. Uniapp provides the uni.clearStorageSync() interface to implement the cache clearing function. This interface does not need to pass in any parameters, just call it directly.

The code is as follows:

uni.clearStorageSync();

This code will clear all cached data of the current application. It should be noted that this interface will only clear the cache data created by the application itself, and will not clear the system-level cache data.

3. Complete cache clearing function implementation

According to the contents of the above two parts, we can combine them to achieve a complete clearing cache function. The code is as follows:

let storageInfo = uni.getStorageInfoSync();
let size = storageInfo.currentSize;

uni.clearStorageSync();

uni.showToast({
  title: '缓存已清除',
  icon: 'success'
});

This code will first obtain the cache size of the current application, then call the interface to clear the cache, and finally use uni.showToast() to pop up a prompt box to prompt the user that the cache has been cleared.

It should be noted that if the application cache is relatively large, clearing the cache may take some time, and the interface may be stuck at this time. In order to avoid this situation, we can add a loading effect when clearing the cache to prompt the user to wait for the clearing to complete.

The code is as follows:

let storageInfo = uni.getStorageInfoSync();
let size = storageInfo.currentSize;

uni.showLoading({
  title: '正在清除缓存'
});

uni.clearStorageSync();

uni.hideLoading();

uni.showToast({
  title: '缓存已清除',
  icon: 'success'
});

This code will first start a loading prompt box to prompt the user that the cache is being cleared, and then call the interface to clear the cache. After the clearing is completed, the loading prompt box is hidden and a prompt box pops up to remind the user that the cache has been cleared.

Summary

Clear cache function is an essential part of mobile application development. In the Uniapp framework, you can use uni.getStorageInfoSync() and uni.clearStorageSync() to implement the cache clearing function. It should be noted that lags may occur during the clearing process, and the loading effect can be used to prompt the user to wait.

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