How to delete local pictures in uniapp

With the continuous development of mobile applications, users have an increasing need to upload and save local images, and the uniapp framework, as a cross-platform development framework, is becoming more and more popular among developers. In uniapp, deleting local images is a common operation, but it may be a little confusing for some novices. This article will introduce how to delete local pictures in uniapp from two aspects to help developers better implement related functions.

1. Use the API provided by uniapp

In the uniapp framework, the uni.removeSavedFile(Object object) method is provided to delete local files. To use this method, you need to pass in an object containing the file path. The code is as follows:

uni.removeSavedFile({
  filePath: '/user/data/picture.jpg',
  success: function (res) {
    console.log(res)
  }
})

When we pass in the object here, the file path uses a relative path. It should be noted that only files saved through uni.saveImageToPhotosAlbum or uni.saveFile can be deleted through uni.removeSavedFile. After successfully deleting the local file, this method returns an object containing information about whether the operation was successful. Developers can determine success based on the object content.

2. Use third-party plug-ins

Sometimes, we may need to delete some local files in non-image formats, and we also hope that the operation of deleting local files can be more convenient. At this time, we can choose some third-party uniapp plug-ins to achieve the function of deleting local files. For example, uni-clear-cache is a very useful plug-in for deleting local cache. The use of this plug-in is very simple and only requires the following steps:

1. Download the plug-in package to the local area.
2. Introduce plug-ins in vue.config.js.

const path = require("path");

function resolve(dir) {
    return path.join(__dirname, dir);
}    
module.exports = {
    configureWebpack: {
        resolve: {
            alias: {
              "@": resolve("src")
          }
      }
    },
    transpileDependencies: ['uni-clear-cache']
};

3. Introduce the uni-clear-cache plugin into the required components.

async function clearCache() {
  try {
    const clearCache = new ClearCache();
    await clearCache.trigger();
    uni.showToast({
      title: '清理完成',
      icon: 'success'
    })
  } catch (e) {
    console.log(e);
    uni.showToast({
      title: '清理失败',
      icon: 'none'
    })
  }
}

In this way, we can delete the local cache simply and conveniently through the plug-in. Of course, in actual use, you also need to choose appropriate plug-ins according to specific needs.

To sum up, uniapp provides a simple and easy-to-use API, and there are also many excellent third-party plug-ins to choose from. Developers can choose according to their needs. I hope this article can be helpful to everyone in deleting local images using the uniapp framework.

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