Use uniapp to implement image cropping function

Use UniApp to realize image cropping function

UniApp is a cross-platform development framework developed based on Vue.js, which can be used to quickly build small programs, H5, Apps, etc. Platform application. To implement the image cropping function in UniApp, you need to use the third-party plug-in uni-image-cropper and combine it with the HTML5 canvas element.

1. Installing the plug-in
   Execute the following command in the root directory of the UniApp project to install the uni-image-cropper plug-in:

   npm install uni-image-cropper

   After the installation is completed, in the main. Introduce the plug-in into the js file:

   import uniImageCropper from '@/components/uni-image-cropper/uni-image-cropper.vue'
   Vue.component('uni-image-cropper',uniImageCropper)

2. Create page
   Create an image cropping page imageCrop.vue in the pages directory, the code is as follows:

   <template>
     <view>
    <view class="wrapper">
      <uni-image-cropper
        ref="imageCropper"
        :src="src"
        :mode="mode"
        :is-show-tool-bar="true"
        tool-bar-open-type="choose">'
      </uni-image-cropper>
    </view>
    <view>
      <button @click="cropImage">裁剪图片</button>
    </view>
     </view>
   </template>
   
   <script>
   export default {
     data() {
    return {
      src: '', // 图片路径
      mode: 'rectangle', // 裁剪框形状，可选值为rectangle或circle
    };
     },
     methods: {
    cropImage() {
      this.$refs.imageCropper.cropImage().then(({
        path
      }) => {
        // 裁剪完成后的操作，path为裁剪后的图片路径
      }).catch((err) => {
        // 裁剪失败时的操作
      });
    },
     },
   };
   </script>
   
   <style>
   .wrapper {
     width: 100%;
     height: 400rpx;
   }
   </style>

3. Introduce the template part of the page that needs to use the image cropping function, by using
   Introduce this component:

   <template>
     <view>
    <image-crop></image-crop>
     </view>
   </template>
   
   <script>
   import imageCrop from '@/pages/imageCrop.vue'
   export default {
     components: {
    imageCrop,
     },
   };
   </script>

Run the project
4. After the above steps are completed, you can select the image for cropping in the image cropping page by running the UniApp project.
   

Summary:

Through the uni-image-cropper plug-in and combined with the HTML5 canvas element, we can implement the image cropping function in UniApp. The above code is only a brief example and does not involve the complete UniApp project code. The code can be extended and optimized based on specific needs.

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