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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