How to implement image cropping and frame selection in uniapp

How to implement image cropping and frame selection in Uniapp

Introduction

Image cropping is one of the common requirements in mobile application development. In Uniapp, we can use some plug-ins or write some custom code to implement the image cropping and frame selection function. This article will introduce how to use the uni-cropper plug-in to implement image cropping and frame selection, and provide relevant code examples.

Steps

1. Install the uni-cropper plug-in

First, install the uni-cropper plug-in in the Uniapp project. You can install it through npm, open the command line tool, enter the project directory, and run the following command:

npm install uni-cropper

After the installation is complete, configure the use of the uni-cropper plug-in in the pages.json file page. Find the page that needs to be cropped with images, and add the following configuration to the pages.json file:

"pages": [
  {
    "path": "pages/cropper/index",
    "style": {
      "navigationBarTitleText": "图片裁剪"
    }
  }
]

2. Use the uni-cropper component on the page

when needed On the page that uses image cropping, add the uni-cropper component. Add the following code in template of the page:

<template>
  <view>
    <uni-cropper :src="imageSrc" @complete="handleCrop" :disable-scale="true" :disable-rotate="true"></uni-cropper>
    <button @tap="selectImage">选择图片</button>
  </view>
</template>

Define the imageSrc variable in data to store the selected image path:

data() {
  return {
    imageSrc: ''
  };
},

uni-cropper The src attribute of the component is bound to imageSrc, which represents the path of the image to be cropped. The @complete event listens to the event after cropping is completed and executes the handleCrop method.

3. Implement the image selection function

Add selectImage to methods on the page. Method:

methods: {
  selectImage() {
    uni.chooseImage({
      count: 1,
      success: (res) => {
        this.imageSrc = res.tempFilePaths[0];
      }
    });
  },
  handleCrop(res) {
    console.log(res);
  }
}

selectImage The method uses the uni.chooseImage API to select an image, and assigns the selected image path to imageSrc. handleCrop The method is used to handle the event after cropping is completed, and the cropped information can be printed out on the console.

4. Configure and start the application

After completing the above steps, you can configure and start the application. Run the following command to start the application:

npm run dev:%PLATFORM%

Replace %PLATFORM% with the platform you want to run it on, for example h5.

Conclusion

The above are the steps to use the uni-cropper plug-in to implement image cropping and frame selection in Uniapp. Through the above code example, you can expand it according to your own needs to achieve richer image cropping functions. Hope this article can be helpful to you!

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