UniApp's tips and practices for taking photos and image processing

UniApp techniques and practices for taking photos and image processing

With the popularity of smartphones and the continuous improvement of camera functions, taking pictures with mobile phones has become an indispensable part of our daily lives. In mobile application development, the camera function has also become one of the important components in many applications. This article will introduce how to use UniApp to implement the camera function and perform some simple image processing on the photos taken.

UniApp is a cross-platform development tool based on the Vue.js framework, which can generate iOS, Android and H5 applications at the same time. It provides an easy way to develop cross-platform applications, greatly saving developers time and energy.

First of all, we need to introduce the uni-app extension plug-in uni-camera into the UniApp project. This plug-in encapsulates the camera function and provides related APIs for developers to use. Add the following configuration to the manifest.json file of the project:

"uni_modules": {
    "uni-camera": {
        "version": "1.2.0",
        "path": "uni_modules/uni-camera"
    }
}

After that, we need to introduce the uni-camera plug-in into the page where we need to use the camera function:

import uniCamera from '@/uni_modules/uni-camera'

Before using the camera function, We also need to configure the application permissions in the manifest.json file to obtain permission to access the camera:

"permission": {
    "scope.camera": {
        "desc": "拍照功能需要获取相机权限"
    }
}

Next, we can use uniCamera's related APIs in events that need to trigger photography, such as in the button's Call the startCamera method in the click event:

uniCamera.startCamera({
    success: (res) => {
        console.log('拍照成功', res.tempImagePath);
        // 可在这里处理拍照后的照片
    },
    fail: (err) => {
        console.error('拍照失败', err);
    }
})

After the photo is taken successfully, we can obtain the photo path after taking the photo through res.tempImagePath. Next, we can perform some simple image processing on the photos after taking them, such as cropping, compression, filter effects, etc.

UniApp provides a series of image processing APIs, such as uni.compressImage, uni.getImageInfo, etc. The following is a sample code that shows how to use these APIs to crop and compress photos after taking them:

uni.compressImage({
    src: res.tempImagePath,
    quality: 80,
    success: (res) => {
        console.log('图片压缩成功', res.tempImagePath);
        uni.getImageInfo({
            src: res.tempImagePath,
            success: (infoRes) => {
                console.log('获取图片信息成功', infoRes.width, infoRes.height);
                // 可在这里对图片进行裁剪等处理
            },
            fail: (infoErr) => {
                console.error('获取图片信息失败', infoErr);
            }
        })
    },
    fail: (compressErr) => {
        console.error('图片压缩失败', compressErr);
    }
})

In the above code, we first use uni.compressImage to compress the photo, and then use uni. getImageInfo obtains the compressed image information, such as width and height, for subsequent operations such as cropping.

Through the above examples, we can briefly understand how to implement the photo taking function in UniApp and perform some simple image processing on the photos taken. Of course, in actual application development, more complex customization and processing of the camera function may be required based on specific needs.

To sum up, UniApp provides a convenient and easy-to-use way to implement photography and image processing functions, and the application can be quickly deployed to multiple platforms. Developers can flexibly use the APIs and plug-ins provided by UniApp to implement richer and more powerful camera applications according to their own needs and situations. I hope this article can be helpful to everyone in implementing the photography and image processing functions in UniApp.

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