How to use the image caching function in uniapp

Uniapp is a cross-platform application framework developed based on Vue.js, which can be coded once and run on multiple terminals. During the development process, using images is a very common requirement, and loading and rendering images consumes more resources and time. In order to improve the performance and user experience of the application, Uniapp provides an image caching function, which can effectively optimize image loading and rendering speed.

To use the image caching function in Uniapp, you need to use the uni.getImageInfo() method to obtain image information, and then save the image information to the local cache. The next time you access the same image, you can read it directly from the cache, avoiding repeated image loading and rendering.

The following is a sample code that uses the image cache function:

<template>
  <view>
    <image :src="imgUrl" mode="widthFix"></image>
  </view>
</template>

<script>
export default {
  data() {
    return {
      imgUrl: '' // 图片路径
    };
  },
  mounted() {
    this.getImageCache();
  },
  methods: {
    // 获取图片缓存
    getImageCache() {
      // 从缓存中获取图片信息
      let cache = uni.getStorageSync('imageCache');
      if (cache && cache.url === this.imgUrl) {
        // 缓存中有图片并且路径相同，直接使用缓存
        this.imgUrl = cache.path;
      } else {
        // 缓存中没有图片或者路径不相同，重新加载图片
        this.loadImage();
      }
    },
    // 加载图片
    loadImage() {
      // 获取图片信息
      uni.getImageInfo({
        src: this.imgUrl,
        success: (res) => {
          // 图片加载成功后将图片信息保存到本地缓存
          uni.setStorageSync('imageCache', {
            url: this.imgUrl,
            path: res.path
          });
          this.imgUrl = res.path; // 使用图片路径渲染
        },
        fail: (err) => {
          console.log('图片加载失败', err);
        }
      });
    }
  }
};
</script>

In the above sample code, first call getImageCache# in the mounted life cycle hook ##Method, this method is used to obtain image cache information. In the getImageCache method, obtain image information from the local cache through the uni.getStorageSync method. If there is an image in the cache and the image path is the same as the current path, use the image in the cache directly. path, otherwise call the loadImage method to reload the image.

loadImageIn the method, use uni.getImageInfo to obtain the image information, and save the image information to the local cache in the success callback, and then Use image paths for rendering.

Through the above code examples, we can use the image caching function in Uniapp to achieve faster image loading and rendering, improving application performance and user experience. This is very beneficial for developing applications with a large number of images.

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